Author: "Steven Gratton" - Searchworks@Jio Institute Digital Library Search Results

Your search keyword '"Steven Gratton"' showing total 29 results

Start Over Author "Steven Gratton"

29 results on '"Steven Gratton"'

1. A Detailed Description of the CAMSPEC Likelihood Pipeline and a Reanalysis of the Planck High Frequency Maps

Author: George Efstathiou and Steven Gratton
Subjects: Astronomy, QB1-991, Astrophysics, QB460-466
Abstract: This paper presents a detailed description of the CamSpec likelihood which has been used to analyse Planck temperature and polarization maps of the cosmic microwave background since the first Planck data release. We have created a number of likelihoods using a range of Galactic sky masks and different methods of temperature foreground cleaning. Our most powerful likelihood uses 80 percent of the sky in temperature and polarization. Our results show that the six-parameter LCDM cosmology provides an excellent fit to the Planck data. There is no evidence for statistically significant internal tensions in the Planck TT, TE and EE spectra computed for different frequency combinations. We present evidence that the tendencies for the Planck temperature power spectra to favour a lensing amplitude A_L>1 and positive spatial curvature are caused by statistical fluctuations in the temperature power spectra. Using our statistically most powerful likelihood, we find that the A_L parameter differs from unity at no more than the 2.2 sigma level. We find no evidence for anomalous shifts in cosmological parameters with multipole range. In fact, we show that the combined TTTEEE likelihood over the restricted multipole range 2-800 gives cosmological parameters for the base LCDM cosmology that are very close to those derived from the full multipole range 2-2500. We present revised constraints on a few extensions of the base LCDM cosmology, focussing on the sum of neutrino masses, number of relativistic species and the tensor-scalar ratio. The results presented here show that the Planck data are remarkably consistent between detector-sets, frequencies and sky area. We find no evidence in our analysis that cosmological parameters determined from the CamSpec likelihood are affected to any significant degree by systematic errors in the Planck data (abridged).
Published: 2021
Full Text: View/download PDF

2. B-mode constraints from Planck low-multipole polarization data

Author: Roger de Belsunce, Steven Gratton, and George Efstathiou
Subjects: Cosmology and Nongalactic Astrophysics (astro-ph.CO), Space and Planetary Science, FOS: Physical sciences, Astronomy and Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, Astrophysics::Galaxy Astrophysics, Astrophysics - Cosmology and Nongalactic Astrophysics
Abstract: We present constraints on primordial B modes from large angular scale cosmic microwave background polarisation anisotropies measured with the Planck satellite. To remove Galactic polarised foregrounds, we use a Bayesian parametric component separation method, modelling synchrotron radiation as a power law and thermal dust emission as a modified blackbody. This method propagates uncertainties from the foreground cleaning into the noise covariance matrices of the maps. We construct two likelihoods: (i) a semi-analytical cross-spectrum-based likelihood-approximation scheme (momento) and (ii) an exact polarisation-only pixel-based likelihood (pixlike). Since momento is based on cross-spectra it is statistically less powerful than pixlike, but is less sensitive to systematic errors correlated across frequencies. Both likelihoods give a tensor-to-scalar ratio, r, that is consistent with zero from low multipole (2, 10 pages, 7 figures
Published: 2022
Full Text: View/download PDF

3. Quantum Reasoning using Lie Algebra for Everyday Life (and AI perhaps...).

Author: Steven Gratton
Published: 2018

4. Graphics Card Computing for Cosmology: Cholesky Factorization.

Author: Steven Gratton
Published: 2010
Full Text: View/download PDF

5. Inference of the optical depth to reionization from low multipole temperature and polarisation Planck data

Author: Steven Gratton, William R. Coulton, Roger de Belsunce, and George Efstathiou
Subjects: Physics, Cosmology and Nongalactic Astrophysics (astro-ph.CO), 010308 nuclear & particles physics, Principle of maximum entropy, Cosmic microwave background, Cosmic background radiation, Estimator, FOS: Physical sciences, Astronomy and Astrophysics, 01 natural sciences, symbols.namesake, Space and Planetary Science, 0103 physical sciences, Optical depth (astrophysics), symbols, Statistical physics, Planck, Multipole expansion, 010303 astronomy & astrophysics, Reionization, Astrophysics - Cosmology and Nongalactic Astrophysics
Abstract: This paper explores methods for constructing low multipole temperature and polarisation likelihoods from maps of the cosmic microwave background anisotropies that have complex noise properties and partial sky coverage. We use Planck 2018 High Frequency Instrument (HFI) and updated SRoll2 temperature and polarisation maps to test our methods. We present three likelihood approximations based on quadratic cross spectrum estimators: (i) a variant of the simulation-based likelihood (SimBaL) techniques used in the Planck legacy papers to produce a low multipole EE likelihood; (ii) a semi-analytical likelihood approximation (momento) based on the principle of maximum entropy; (iii) a density-estimation `likelihood-free' scheme (DELFI). Approaches (ii) and (iii) can be generalised to produce low multipole joint temperature-polarisation (TTTEEE) likelihoods. We present extensive tests of these methods on simulations with realistic correlated noise. We then analyse the Planck data and confirm the robustness of our method and likelihoods on multiple inter- and intra-frequency detector set combinations of SRoll2 maps. The three likelihood techniques give consistent results and support a low value of the optical depth to reoinization, tau, from the HFI. Our best estimate of tau comes from combining the low multipole SRoll2 momento (TTTEEE) likelihood with the CamSpec high multipole likelihood and is tau = 0.0627+0.0050-0.0058. This is consistent with the SRoll2 team's determination of tau, though slightly higher by 0.5 sigma, mainly because of our joint treatment of temperature and polarisation., 20 pages, 15 figures; published in MNRAS
Published: 2021

6. Planck 2018 results: VI. Cosmological parameters (Corrigendum)

Author: Jose M. Diego, F. Piacentini, Soumen Basak, M. Frailis, Carlo Baccigalupi, M. Ashdown, H. K. Eriksen, François Levrier, E. Hivon, Reijo Keskitalo, L. Pagano, Hannu Kurki-Suonio, A. Renzi, F. Cuttaia, F. R. Bouchet, F. Villa, R. Fernandez-Cobos, L. Montier, Charles R. Lawrence, R. B. Barreiro, Simon D. M. White, Jean-François Cardoso, Tuhin Ghosh, A. Mennella, Nabila Aghanim, Zhiqi Huang, Hans Ulrik Nørgaard-Nielsen, P. Vielva, R. C. Butler, K. M. Górski, K. Kiiveri, Gianmarco Maggio, P. de Bernardis, Luca Valenziano, Steven Gratton, Lloyd Knox, Andrea Zacchei, Jonathan Aumont, F. K. Hansen, P. Bielewicz, Guilaine Lagache, Jörg P. Rachen, S. R. Hildebrandt, Antony Lewis, M. López-Caniego, D. Herranz, M. Le Jeune, N. Mandolesi, Julien Lesgourgues, Benjamin D. Wandelt, Julian Borrill, Peter G. Martin, Will Handley, L. Vibert, Jens Chluba, Peter Meinhold, Michele Liguori, Jan Hamann, G. Roudier, Diego Molinari, Andrei V. Frolov, J.-M. Delouis, J. González-Nuevo, Aurelien A. Fraisse, M. Sandri, Ingunn Kathrine Wehus, M. Tenti, B. P. Crill, J.-L. Puget, L. Salvati, X. Dupac, Massimiliano Lattanzi, Karim Benabed, Locke D. Spencer, Paolo Natoli, Francesco Forastieri, Nicola Bartolo, Erminia Calabrese, J.-P. Bernard, Marzieh Farhang, J. F. Macías-Pérez, Nicola Vittorio, V. Lindholm, A.-S. Suur-Uski, Adam Moss, E. Franceschi, W. C. Jones, P. Lemos, A. Karakci, D. Tavagnacco, Ricardo Genova-Santos, Tiziana Trombetti, B. Van Tent, Alessandro Gruppuso, Marius Millea, Graca Rocha, Sabino Matarrese, Theodore Kisner, Richard A. Battye, M. Martinelli, A. J. Banday, D. Contreras, J.-M. Lamarre, Ken Ganga, B. Partridge, Yabebal Fantaye, Jan Tauber, N. Mauri, J. J. Bock, Martin Kunz, E. Martínez-González, Jose Alberto Rubino-Martin, A. Ducout, Mathieu Remazeilles, S. Galeotta, Marian Douspis, Chiara Sirignano, O. Doré, Jon E. Gudmundsson, G. de Zotti, Hiranya V. Peiris, Yashar Akrami, Anthony Challinor, Michele Maris, M. Savelainen, Francesca Perrotta, P. B. Lilje, Torsten A. Enßlin, Valeria Pettorino, M. Tomasi, Jacques Delabrouille, Martin Reinecke, Marco Bersanelli, J. B. Kim, G. Sirri, Yin-Zhe Ma, E. P. S. Shellard, Fabio Finelli, S. Dusini, Andrea Zonca, H. C. Chiang, Martin White, M. Bucher, Douglas Scott, A. Mangilli, A. Marcos-Caballero, L. P. L. Colombo, Mario Ballardini, Daniela Paoletti, Jussi Valiviita, George Efstathiou, F. Boulanger, G. Polenta, Julien Carron, L. Toffolatti, Anthony Lasenby, Martina Gerbino, E. Keihänen, Andrew H. Jaffe, Marc-Antoine Miville-Deschênes, Philip Lubin, Davide Maino, M. Lilley, M. Migliaccio, J. R. Bond, B. Ruiz-Granados, Jason D. McEwen, Carlo Burigana, Nicoletta Krachmalnicoff, James R. Fergusson, Subhasish Mitra, C. Combet, R. A. Sunyaev, E. Di Valentino, G. Patanchon, L. Polastri, Alessandro Melchiorri, S. Galli, Gianluca Morgante, Franz Elsner, C. Rosset, and Universidad de Cantabria
Subjects: Physics, Numerical error, 010308 nuclear & particles physics, Astronomy, Cosmological parameters, Astronomy and Astrophysics, Astrophysics, Cosmic background radiation, 01 natural sciences, Upper and lower bounds, Errata, addenda, Combinatorics, symbols.namesake, 13. Climate action, Space and Planetary Science, 0103 physical sciences, Optical depth (astrophysics), symbols, Planck, 010306 general physics
Abstract: Author(s): Aghanim, N; Akrami, Y; Ashdown, M; Aumont, J; Baccigalupi, C; Ballardini, M; Banday, AJ; Barreiro, RB; Bartolo, N; Basak, S; Battye, R; Benabed, K; Bernard, JP; Bersanelli, M; Bielewicz, P; Bock, JJ; Bond, JR; Borrill, J; Bouchet, FR; Boulanger, F; Bucher, M; Burigana, C; Butler, RC; Calabrese, E; Cardoso, JF; Carron, J; Challinor, A; Chiang, HC; Chluba, J; Colombo, LPL; Combet, C; Contreras, D; Crill, BP; Cuttaia, F; De Bernardis, P; De Zotti, G; Delabrouille, J; Delouis, JM; DI Valentino, E; DIego, JM; Dore, O; Douspis, M; Ducout, A; Dupac, X; Dusini, S; Efstathiou, G; Elsner, F; Enslin, TA; Eriksen, HK; Fantaye, Y; Farhang, M; Fergusson, J; Fernandez-Cobos, R; Finelli, F; Forastieri, F; Frailis, M; Fraisse, AA; Franceschi, E; Frolov, A; Galeotta, S; Galli, S; Ganga, K; Genova-Santos, RT; Gerbino, M; Ghosh, T; Gonzalez-Nuevo, J; Gorski, KM; Gratton, S; Gruppuso, A; Gudmundsson, JE; Hamann, J; Handley, W; Hansen, FK; Herranz, D; Hildebrandt, SR; Hivon, E; Huang, Z; Jaffe, AH; Jones, WC; Karakci, A; Keihanen, E; Keskitalo, R; Kiiveri, K; Kim, J; Kisner, TS | Abstract: In the original version, the bounds given in Eqs. (87a) and (87b) on the contribution to the early-time optical depth, (15,30), contained a numerical error in deriving the 95th percentile from the Monte Carlo samples. The corrected 95% upper bounds are: τ(15,30) l 0:018 (lowE, flat τ(15, 30), FlexKnot), (1) τ(15, 30) l 0:023 (lowE, flat knot, FlexKnot): (2) These bounds are a factor of 3 larger than the originally reported results. Consequently, the new bounds do not significantly improve upon previous results from Planck data presented in Millea a Bouchet (2018) as was stated, but are instead comparable. Equations (1) and (2) give results that are now similar to those of Heinrich a Hu (2021), who used the same Planck 2018 data to derive a 95% upper bound of 0.020 using the principal component analysis (PCA) model and uniform priors on the PCA mode amplitudes.
Published: 2021
Full Text: View/download PDF

7. Planck 2018 results

Author: Jean-François Cardoso, A. A. Fraisse, P. Vielva, A. J. Banday, Charles R. Lawrence, Yabebal Fantaye, Alessandro Gruppuso, Krzysztof M. Gorski, J.-L. Puget, B. D. Wandelt, Guilaine Lagache, A. Mangilli, M. López-Caniego, P. de Bernardis, R. B. Barreiro, M.-A. Miville-Deschênes, Matthieu Tristram, K. Kiiveri, M. Frailis, Carlo Baccigalupi, François Levrier, E. Hivon, S. Galli, J. Aumont, François R. Bouchet, A. Renzi, Reijo Keskitalo, Michele Liguori, Sabino Matarrese, Diego Molinari, M. Ashdown, A. Mennella, Nabila Aghanim, F. K. Hansen, A. Ducout, E. Martínez-González, J.-M. Lamarre, B. Partridge, Gianluca Morgante, Yashar Akrami, Anthony Challinor, H. K. Eriksen, L. P. L. Colombo, L. Pagano, L. Patrizii, Marian Douspis, J.-M. Delouis, O. Perdereau, Alessandro Melchiorri, X. Dupac, N. Mandolesi, Andrew H. Jaffe, Hannu Kurki-Suonio, J. A. Tauber, M. Savelainen, M. Tomasi, Mario Ballardini, George Efstathiou, Nicola Bartolo, Andrea Zonca, H. C. Chiang, N. Mauri, O. Doré, L. Vibert, Theodore Kisner, Steven Gratton, Marco Bersanelli, Andrei V. Frolov, L. Salvati, Erminia Calabrese, A. Moneti, L. Montier, J. B. Kim, A.-S. Suur-Uski, Martina Gerbino, G. Sirri, Tuhin Ghosh, J. F. Macías-Pérez, F. Boulanger, P. B. Lilje, J. Valiviita, G. Patanchon, Adam Moss, Ricardo Genova-Santos, M. Migliaccio, Graca Rocha, Zhiqi Huang, C. Combet, E. Falgarone, Valeria Pettorino, Ingunn Kathrine Wehus, M. Bucher, Douglas Scott, D. Tavagnacco, M. Sandri, Jacques Delabrouille, S. Mottet, G. Roudier, J. González-Nuevo, L. Toffolatti, Davide Maino, Julian Borrill, Massimiliano Lattanzi, Will Handley, Jörg P. Rachen, M. Tenti, Anthony Lasenby, Fabio Finelli, E. Keihänen, Tiziana Trombetti, E. Di Valentino, Francesca Perrotta, Sophie Henrot-Versille, E. Franceschi, Gianmarco Maggio, F. Cuttaia, Fabrizio Villa, J.-P. Bernard, Torsten A. Enßlin, D. Herranz, D. Paoletti, Paolo Natoli, A. Karakci, F. Vansyngel, P. Bielewicz, W. C. Jones, Julien Carron, Peter G. Martin, S. Galeotta, Yin-Zhe Ma, K. Benabed, K. Ganga, Jose M. Diego, J. R. Bond, F. Piacentini, Soumen Basak, M. Reinecke, R. A. Sunyaev, Chiara Sirignano, G. de Zotti, F. Couchot, Franz Elsner, B. P. Crill, B. Van Tent, Nicola Vittorio, V. Lindholm, Jason D. McEwen, Martin Kunz, Carlo Burigana, Nicoletta Krachmalnicoff, Mathieu Remazeilles, Jon E. Gudmundsson, A. de Rosa, Locke D. Spencer, Institut d'astrophysique spatiale (IAS), Université Paris-Sud - Paris 11 (UP11)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), Institut de recherche en astrophysique et planétologie (IRAP), Institut national des sciences de l'Univers (INSU - CNRS)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Observatoire Midi-Pyrénées (OMP), Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Centre National de la Recherche Scientifique (CNRS), Institut d'Astrophysique de Paris (IAP), Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Canadian Institute for Theoretical Astrophysics (CITA), Lawrence Berkeley National Laboratory [Berkeley] (LBNL), Laboratoire d'Etude du Rayonnement et de la Matière en Astrophysique (LERMA), École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université de Cergy Pontoise (UCP), Université Paris-Seine-Université Paris-Seine-Centre National de la Recherche Scientifique (CNRS), AstroParticule et Cosmologie (APC (UMR_7164)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Université de Paris (UP), Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ), Université Grenoble Alpes (UGA), Laboratoire de l'Accélérateur Linéaire (LAL), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Dipartimento di Fisica [Roma La Sapienza], Università degli Studi di Roma 'La Sapienza' = Sapienza University [Rome], Jet Propulsion Laboratory (JPL), NASA-California Institute of Technology (CALTECH), Max-Planck-Institut für Astronomie (MPIA), Max-Planck-Gesellschaft, Laboratoire d'Etude du Rayonnement et de la Matière en Astrophysique (LERMA (UMR_8112)), Sorbonne Université (SU)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université de Cergy Pontoise (UCP), Université Paris-Seine-Université Paris-Seine-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL), Laboratoire d'Astrophysique de Marseille (LAM), Aix Marseille Université (AMU)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS), Dipartimento di Fisica 'G. Galilei', Universita degli Studi di Padova, Astrophysique Interprétation Modélisation (AIM (UMR_7158 / UMR_E_9005 / UM_112)), Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7), University of Manchester [Manchester], University of British Columbia (UBC), Laboratoire de Physique des 2 Infinis Irène Joliot-Curie (IJCLab), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Planck Collaboration, Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Sud - Paris 11 (UP11), Centre National de la Recherche Scientifique (CNRS)-Observatoire Midi-Pyrénées (OMP), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Institut national des sciences de l'Univers (INSU - CNRS), Sorbonne Université (SU)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Cergy Pontoise (UCP), Université Paris-Seine-Université Paris-Seine-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2020-....] (UGA [2020-....])-Institut polytechnique de Grenoble - Grenoble Institute of Technology [2020-....] (Grenoble INP [2020-....]), Université Grenoble Alpes [2020-....] (UGA [2020-....]), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique Théorique d'Orsay [Orsay] (LPT), Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11), Planck, Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS), Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, PSL Research University (PSL)-PSL Research University (PSL)-Université de Cergy Pontoise (UCP), Université Paris-Seine-Université Paris-Seine-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Observatoire de Paris, PSL Research University (PSL)-PSL Research University (PSL)-Université Paris Diderot - Paris 7 (UPD7), Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA), Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Aix Marseille Université (AMU)-Centre National d'Études Spatiales [Toulouse] (CNES), Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS), Institut de Recherche pour le Développement (IRD)-Centre National de la Recherche Scientifique (CNRS)-Université Fédérale Toulouse Midi-Pyrénées-Centre National d'Études Spatiales [Toulouse] (CNES)-Météo France-Institut de Recherche pour le Développement (IRD)-Centre National de la Recherche Scientifique (CNRS)-Université Fédérale Toulouse Midi-Pyrénées-Centre National d'Études Spatiales [Toulouse] (CNES)-Météo France-Université Toulouse III - Paul Sabatier (UT3), Aghanim N., Akrami Y., Ashdown M., Aumont J., Baccigalupi C., Ballardini M., Banday A.J., Barreiro R.B., Bartolo N., Basak S., Benabed K., Bernard J.-P., Bersanelli M., Bielewicz P., Bond J.R., Borrill J., Bouchet F.R., Boulanger F., Bucher M., Burigana C., Calabrese E., Cardoso J.-F., Carron J., Challinor A., Chiang H.C., Colombo L.P.L., Combet C., Couchot F., Crill B.P., Cuttaia F., De Bernardis P., De Rosa A., De Zotti G., Delabrouille J., Delouis J.-M., Di Valentino E., Diego J.M., Dore O., Douspis M., Ducout A., Dupac X., Efstathiou G., Elsner F., Ensslin T.A., Eriksen H.K., Falgarone E., Fantaye Y., Finelli F., Frailis M., Fraisse A.A., Franceschi E., Frolov A., Galeotta S., Galli S., Ganga K., Genova-Santos R.T., Gerbino M., Ghosh T., Gonzalez-Nuevo J., Gorski K.M., Gratton S., Gruppuso A., Gudmundsson J.E., Handley W., Hansen F.K., Henrot-Versille S., Herranz D., Hivon E., Huang Z., Jaffe A.H., Jones W.C., Karakci A., Keihanen E., Keskitalo R., Kiiveri K., Kim J., Kisner T.S., Krachmalnicoff N., Kunz M., Kurki-Suonio H., Lagache G., Lamarre J.-M., Lasenby A., Lattanzi M., Lawrence C.R., Levrier F., Liguori M., Lilje P.B., Lindholm V., Lopez-Caniego M., Ma Y.-Z., Macias-Perez J.F., Maggio G., Maino D., Mandolesi N., Mangilli A., Martin P.G., Martinez-Gonzalez E., Matarrese S., Mauri N., McEwen J.D., Melchiorri A., Mennella A., Migliaccio M., Miville-Deschenes M.-A., Molinari D., Moneti A., Montier L., Morgante G., Moss A., Mottet S., Natoli P., Pagano L., Paoletti D., Partridge B., Patanchon G., Patrizii L., Perdereau O., Perrotta F., Pettorino V., Piacentini F., Puget J.-L., Rachen J.P., Reinecke M., Remazeilles M., Renzi A., Rocha G., Roudier G., Salvati L., Sandri M., Savelainen M., Scott D., Sirignano C., Sirri G., Spencer L.D., Sunyaev R., Suur-Uski A.-S., Tauber J.A., Tavagnacco D., Tenti M., Toffolatti L., Tomasi M., Tristram M., Trombetti T., Valiviita J., Vansyngel F., Van Tent B., Vibert L., Vielva P., Villa F., Vittorio N., Wandelt B.D., Wehus I.K., Zonca A., Ministerio de Economía y Competitividad (España), Consejo Superior de Investigaciones Científicas (España), European Commission, European Research Council, European Space Agency, Observatoire de Paris, PSL Research University (PSL)-PSL Research University (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Université Paris-Sud - Paris 11 (UP11)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Centre National d’Études Spatiales [Paris] (CNES), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire Midi-Pyrénées (OMP), Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Centre National de la Recherche Scientifique (CNRS), École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité), Università degli Studi di Roma 'La Sapienza' = Sapienza University [Rome] (UNIROMA), Università degli Studi di Padova = University of Padua (Unipd), Astrophysique Interprétation Modélisation (AIM (UMR7158 / UMR_E_9005 / UM_112)), Universidad de Cantabria, Department of Physics, Helsinki Institute of Physics, and Doctoral Programme in Particle Physics and Universe Sciences
Subjects: Cosmology and Nongalactic Astrophysics (astro-ph.CO), Astronomy, Cosmic microwave background, Cosmic background radiation, FOS: Physical sciences, Astrophysics, cosmic background radiation, Surveys, 01 natural sciences, Cosmology: observation, NO, symbols.namesake, Settore FIS/05 - Astronomia e Astrofisica, surveys, 0103 physical sciences, Calibration, Planck, observations [Cosmology], data analysis [Methods], 010303 astronomy & astrophysics, Reionization, LATITUDE MOLECULAR GAS, Physics, SPECTRUM, 010308 nuclear & particles physics, cosmology: observations, methods: data analysis, Settore FIS/05, Detector, Astrophysics::Instrumentation and Methods for Astrophysics, Astronomy and Astrophysics, 115 Astronomy, Space science, Computational physics, MODEL, Dipole, Amplitude, SKY MAPS, Cosmic background radiation, Cosmology: observations, Methods: data analysis, Surveys, Space and Planetary Science, SEPARATION, symbols, [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph], Astrophysics - Cosmology and Nongalactic Astrophysics, Methods: data analysi
Abstract: Planck Collaboration: et al., This paper presents the High Frequency Instrument (HFI) data processing procedures for the Planck 2018 release. Major improvements in mapmaking have been achieved since the previous Planck 2015 release, many of which were used and described already in an intermediate paper dedicated to the Planck polarized data at low multipoles. These improvements enabled the first significant measurement of the reionization optical depth parameter using Planck-HFI data. This paper presents an extensive analysis of systematic effects, including the use of end-to-end simulations to facilitate their removal and characterize the residuals. The polarized data, which presented a number of known problems in the 2015 Planck release, are very significantly improved, especially the leakage from intensity to polarization. Calibration, based on the cosmic microwave background (CMB) dipole, is now extremely accurate and in the frequency range 100–353 GHz reduces intensity-to-polarization leakage caused by calibration mismatch. The Solar dipole direction has been determined in the three lowest HFI frequency channels to within one arc minute, and its amplitude has an absolute uncertainty smaller than 0.35 μK, an accuracy of order 10−4. This is a major legacy from the Planck HFI for future CMB experiments. The removal of bandpass leakage has been improved for the main high-frequency foregrounds by extracting the bandpass-mismatch coefficients for each detector as part of the mapmaking process; these values in turn improve the intensity maps. This is a major change in the philosophy of “frequency maps”, which are now computed from single detector data, all adjusted to the same average bandpass response for the main foregrounds. End-to-end simulations have been shown to reproduce very well the relative gain calibration of detectors, as well as drifts within a frequency induced by the residuals of the main systematic effect (analogue-to-digital convertor non-linearity residuals). Using these simulations, we have been able to measure and correct the small frequency calibration bias induced by this systematic effect at the 10−4 level. There is no detectable sign of a residual calibration bias between the first and second acoustic peaks in the CMB channels, at the 10−3 level., The Planck Collaboration acknowledges the support of: ESA; CNES and CNRS/INSU-IN2P3-INP (France); ASI, CNR, and INAF (Italy); NASA and DoE (USA); STFC and UKSA (UK); CSIC, MINECO, JA, and RES (Spain); Tekes, AoF, and CSC (Finland); DLR and MPG (Germany); CSA (Canada); DTU Space (Denmark); SER/SSO (Switzerland); RCN (Norway); SFI (Ireland); FCT/MCTES (Portugal); ERC and PRACE (EU). A description of the Planck Collaboration and a list of its members, indicating which technical or scientific activities they have been involved in, can be found at http://www.cosmos.esa.int/web/planck/planckcollaboration.
Published: 2020
Full Text: View/download PDF

8. The evidence for a spatially flat Universe

Author: Steven Gratton and George Efstathiou
Subjects: High Energy Physics - Theory, Cosmology and Nongalactic Astrophysics (astro-ph.CO), media_common.quotation_subject, Cosmic microwave background, Cosmic background radiation, FOS: Physical sciences, Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, 01 natural sciences, symbols.namesake, 0103 physical sciences, Planck, 010303 astronomy & astrophysics, media_common, Inflation (cosmology), Physics, 010308 nuclear & particles physics, Shape of the universe, Astronomy and Astrophysics, Planck temperature, Universe, High Energy Physics - Theory (hep-th), Space and Planetary Science, symbols, Baryon acoustic oscillations, Astrophysics - Cosmology and Nongalactic Astrophysics
Abstract: We revisit the observational constraints on spatial curvature following recent claims that the Planck data favour a closed Universe. We use a new and statistically powerful Planck likelihood to show that the Planck temperature and polarization spectra are consistent with a spatially flat Universe, though because of a geometrical degeneracy cosmic microwave background spectra on their own do not lead to tight constraints on the curvature density parameter Omega_K. When combined with other astrophysical data, particularly geometrical measurements of baryon acoustic oscillations, the Universe is constrained to be spatially flat to extremely high precision, with Omega_ K = 0.0004 +/-0.0018 in agreement with the 2018 results of the Planck team. In the context of inflationary cosmology, the observations offer strong support for models of inflation with a large number of e-foldings and disfavour models of incomplete inflation., Comment: submitted to MNRAS
Published: 2020
Full Text: View/download PDF

9. Understanding parameter differences between analyses employing nested data subsets

Author: Steven Gratton, Anthony Challinor, Challinor, Anthony [0000-0003-3479-7823], and Apollo - University of Cambridge Repository
Subjects: Physics, methods: statistical, Cosmology and Nongalactic Astrophysics (astro-ph.CO), 010308 nuclear & particles physics, FOS: Physical sciences, Astronomy and Astrophysics, Variance (accounting), computer.software_genre, 01 natural sciences, Measure (mathematics), methods: analytical, Methods statistical, Space and Planetary Science, Argument, 0103 physical sciences, Nested data, Noise (video), Data mining, Astrophysics - Instrumentation and Methods for Astrophysics, 010303 astronomy & astrophysics, computer, Instrumentation and Methods for Astrophysics (astro-ph.IM), Astrophysics - Cosmology and Nongalactic Astrophysics
Abstract: We provide an analytical argument for understanding the likely nature of parameter shifts between those coming from an analysis of a dataset and from a subset of that dataset, assuming differences are down to noise and any intrinsic variance alone. This gives us a measure against which we can interpret changes seen in parameters and make judgements about the coherency of the data and the suitability of a model in describing those data., Comment: 7 pages, 3 figures
Published: 2020

10. Model independentH(z) reconstruction using the cosmic inverse distance ladder

Author: Steven Gratton, George Efstathiou, Elizabeth Lee, P. Lemos, and Apollo - University of Cambridge Repository
Subjects: Cosmology and Nongalactic Astrophysics (astro-ph.CO), Cosmic microwave background, FOS: Physical sciences, Astrophysics::Cosmology and Extragalactic Astrophysics, distance scale, 01 natural sciences, Cosmology, symbols.namesake, Theoretical physics, Friedmann–Lemaître–Robertson–Walker metric, 0103 physical sciences, cosmological parameters, Planck, 010303 astronomy & astrophysics, Physics, 010308 nuclear & particles physics, Cosmic distance ladder, Astronomy and Astrophysics, CMB cold spot, Redshift, Space and Planetary Science, cosmology: observations, symbols, large-scale structure of Universe, Astrophysics - Cosmology and Nongalactic Astrophysics, Hubble's law
Abstract: Recent distance ladder determinations of the Hubble constant $H_0$ disagree at about the $3.5\sigma$ level with the value determined from Planck measurements of the cosmic microwave background (CMB) assuming a $\Lambda$CDM cosmology. This discrepancy has prompted speculation that new physics might be required beyond that assumed in the $\Lambda$CDM model. In this paper, we apply the inverse distance ladder to fit a parametric form of $H(z)$ to baryon acoustic oscillation (BAO) and Type Ia supernova data together with priors on the sound horizon at the end of the radiation drag epoch, $r_d$. We apply priors on $r_d$, based on inferences from either Planck or the Wilkinson Microwave Anistropy Probe (WMAP), and demonstrate that these values are consistent with CMB-independent determinations of $r_d$ derived from measurements of the primordial deuterium abundance, BAO and supernova data assuming the $\Lambda$CDM cosmology. The $H(z)$ constraints that we derive are independent of detailed physics within the dark sector at low redshifts, relying only on the validity of the Friedmann-Robertson-Walker (FRW) metric of General Relativity. For each assumed prior on $r_d$, we find consistency with the inferred value of $H_0$ and the Planck $\Lambda$CDM value and corresponding tension with the distance ladder estimate., Comment: 8 pages, 9 figures
Published: 2018
Full Text: View/download PDF

11. Planck 2018 results. VIII. Gravitational lensing

Author: Charles R. Lawrence, L. Pagano, Andrea Zacchei, J. B. Kim, K. Benabed, E. Martínez-González, Francesco Forastieri, M. Migliaccio, Martin White, M. Bucher, J. R. Bond, B. Ruiz-Granados, Andrea Zonca, N. Mauri, J. J. Bock, Douglas Scott, Davide Maino, H. C. Chiang, Yashar Akrami, Anthony Challinor, M. Tenti, Michele Maris, J. A. Tauber, M. Savelainen, O. Doré, K. Ganga, P. Bielewicz, Tiziana Trombetti, Jose M. Diego, Jean-François Cardoso, Francesca Perrotta, J. Aumont, Torsten A. Enßlin, M. Ashdown, H. K. Eriksen, X. Dupac, P. B. Lilje, Krzysztof M. Gorski, A. Marcos-Caballero, M. Reinecke, A. Mennella, Nabila Aghanim, R. A. Sunyaev, Julien Carron, Paolo Natoli, Franz Elsner, L. Montier, A. Mangilli, F. Cuttaia, Martin Kunz, Mathieu Remazeilles, R. B. Barreiro, F. Piacentini, G. Roudier, J.-L. Puget, K. Kiiveri, Guilaine Lagache, M.-A. Miville-Deschênes, L. Salvati, J. F. Macías-Pérez, Jon E. Gudmundsson, Yin-Zhe Ma, Jason D. McEwen, Zhiqi Huang, M. López-Caniego, Jose Alberto Rubino-Martin, L. P. L. Colombo, Martina Gerbino, G. Polenta, A. Moneti, F. K. Hansen, S. Galli, Soumen Basak, Mario Ballardini, Graca Rocha, J.-P. Bernard, Carlo Burigana, Nicoletta Krachmalnicoff, Chiara Sirignano, Sabino Matarrese, G. de Zotti, A. Renzi, C. Combet, Benjamin D. Wandelt, Julian Borrill, George Efstathiou, M. Frailis, Carlo Baccigalupi, Andrei V. Frolov, Jörg P. Rachen, Antony Lewis, Valeria Pettorino, François Levrier, E. Hivon, Will Handley, E. Di Valentino, Jacques Delabrouille, N. Mandolesi, Gianluca Morgante, Andrew H. Jaffe, Philip Lubin, Ingunn Kathrine Wehus, Diego Molinari, L. Toffolatti, A. J. Banday, Fabio Finelli, Massimiliano Lattanzi, Tuhin Ghosh, P. de Bernardis, R. Fernandez-Cobos, Aurelien A. Fraisse, B. P. Crill, B. Van Tent, P. Vielva, Erminia Calabrese, C. Rosset, Michele Liguori, Fabrizio Villa, Anthony Lasenby, Adam Moss, Ricardo Genova-Santos, E. Keihänen, E. Franceschi, Yabebal Fantaye, D. Tavagnacco, Nicola Bartolo, Marian Douspis, Nicola Vittorio, A. Karakci, W. C. Jones, A.-S. Suur-Uski, V. Lindholm, J. Valiviita, Peter G. Martin, S. Galeotta, Alessandro Gruppuso, J. González-Nuevo, J.-M. Lamarre, B. Partridge, A. Ducout, D. Paoletti, Hannu Kurki-Suonio, Steven Gratton, Lloyd Knox, L. Polastri, Alessandro Melchiorri, Reijo Keskitalo, M. Tomasi, Marco Bersanelli, Jan Hamann, Simon D. M. White, M. Sandri, Gianmarco Maggio, G. Patanchon, D. Herranz, M. Le Jeune, F. Boulanger, François R. Bouchet, Institut d'astrophysique spatiale (IAS), Université Paris-Sud - Paris 11 (UP11)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), Institut de recherche en astrophysique et planétologie (IRAP), Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Observatoire Midi-Pyrénées (OMP), Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS), Institut d'Astrophysique de Paris (IAP), Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Laboratoire d'Etude du Rayonnement et de la Matière en Astrophysique (LERMA (UMR_8112)), Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, PSL Research University (PSL)-PSL Research University (PSL)-Université de Cergy Pontoise (UCP), Université Paris-Seine-Université Paris-Seine-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), AstroParticule et Cosmologie (APC (UMR_7164)), Observatoire de Paris, PSL Research University (PSL)-PSL Research University (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA), Laboratoire d'Astrophysique de Marseille (LAM), Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Aix Marseille Université (AMU)-Centre National d'Études Spatiales [Toulouse] (CNES), Astrophysique Interprétation Modélisation (AIM (UMR_7158 / UMR_E_9005 / UM_112)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique Théorique d'Orsay [Orsay] (LPT), Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS), Planck, Ministerio de Economía y Competitividad (España), Consejo Superior de Investigaciones Científicas (España), European Commission, European Research Council, European Space Agency, Centre National de la Recherche Scientifique (CNRS)-Observatoire Midi-Pyrénées (OMP), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Institut national des sciences de l'Univers (INSU - CNRS), Sorbonne Université (SU)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Cergy Pontoise (UCP), Université Paris-Seine-Université Paris-Seine-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Université de Paris (UP), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2020-....] (UGA [2020-....])-Institut polytechnique de Grenoble - Grenoble Institute of Technology [2020-....] (Grenoble INP [2020-....]), Université Grenoble Alpes [2020-....] (UGA [2020-....]), Aix Marseille Université (AMU)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7), Universidad de Cantabria, Université Paris-Sud - Paris 11 (UP11)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Centre National d’Études Spatiales [Paris] (CNES), Astrophysique, Laboratoire de physique de l'ENS - ENS Paris (LPENS), Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité)-Département de Physique de l'ENS-PSL, École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité)-Département de Physique de l'ENS-PSL, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire Midi-Pyrénées (OMP), Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Centre National de la Recherche Scientifique (CNRS), Università degli studi di Parma = University of Parma (UNIPR), Computing and Mathematical Sciences [Pasadena]], California Institute of Technology (CALTECH), Canadian Institute for Theoretical Astrophysics (CITA), Lawrence Berkeley National Laboratory [Berkeley] (LBNL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité), Centre National d'Études Spatiales [Toulouse] (CNES), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ), Université Grenoble Alpes (UGA), Dipartimento di Fisica [Roma La Sapienza], Università degli Studi di Roma 'La Sapienza' = Sapienza University [Rome] (UNIROMA), Jet Propulsion Laboratory (JPL), NASA-California Institute of Technology (CALTECH), Laboratory for Phytosanitary Diagnostics and Forecasts, All-Russian Institute for Plant Protection, Russian Academy of Sciences [Moscow] (RAS), Institut National Polytechnique (Toulouse) (Toulouse INP), Université de Toulouse (UT), ICRA and Physics Department, Dipartimento di Fisica 'G. Galilei', Università degli Studi di Padova = University of Padua (Unipd), Astrophysique Interprétation Modélisation (AIM (UMR7158 / UMR_E_9005 / UM_112)), University of Manchester [Manchester], Venetian Institute Molecular Medicine (VIMM), University of British Columbia (UBC), Laboratoire de Physique des 2 Infinis Irène Joliot-Curie (IJCLab), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Planck Collaboration, European Project: 616170,EC:FP7:ERC,ERC-2013-CoG,COSMOPARS(2014), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Observatoire de Paris, PSL Research University (PSL)-PSL Research University (PSL)-Université Paris Diderot - Paris 7 (UPD7), Aghanim N., Akrami Y., Ashdown M., Aumont J., Baccigalupi C., Ballardini M., Banday A.J., Barreiro R.B., Bartolo N., Basak S., Benabed K., Bernard J.-P., Bersanelli M., Bielewicz P., Bock J.J., Bond J.R., Borrill J., Bouchet F.R., Boulanger F., Bucher M., Burigana C., Calabrese E., Cardoso J.-F., Carron J., Challinor A., Chiang H.C., Colombo L.P.L., Combet C., Crill B.P., Cuttaia F., De Bernardis P., De Zotti G., Delabrouille J., Di Valentino E., Diego J.M., Dore O., Douspis M., Ducout A., Dupac X., Efstathiou G., Elsner F., Ensslin T.A., Eriksen H.K., Fantaye Y., Fernandez-Cobos R., Finelli F., Forastieri F., Frailis M., Fraisse A.A., Franceschi E., Frolov A., Galeotta S., Galli S., Ganga K., Genova-Santos R.T., Gerbino M., Ghosh T., Gonzalez-Nuevo J., Gorski K.M., Gratton S., Gruppuso A., Gudmundsson J.E., Hamann J., Handley W., Hansen F.K., Herranz D., Hivon E., Huang Z., Jaffe A.H., Jones W.C., Karakci A., Keihanen E., Keskitalo R., Kiiveri K., Kim J., Knox L., Krachmalnicoff N., Kunz M., Kurki-Suonio H., Lagache G., Lamarre J.-M., Lasenby A., Lattanzi M., Lawrence C.R., Le Jeune M., Levrier F., Lewis A., Liguori M., Lilje P.B., Lindholm V., Lopez-Caniego M., Lubin P.M., Ma Y.-Z., Macias-Perez J.F., Maggio G., Maino D., Mandolesi N., Mangilli A., Marcos-Caballero A., Maris M., Martin P.G., Martinez-Gonzalez E., Matarrese S., Mauri N., McEwen J.D., Melchiorri A., Mennella A., Migliaccio M., Miville-Deschenes M.-A., Molinari D., Moneti A., Montier L., Morgante G., Moss A., Natoli P., Pagano L., Paoletti D., Partridge B., Patanchon G., Perrotta F., Pettorino V., Piacentini F., Polastri L., Polenta G., Puget J.-L., Rachen J.P., Reinecke M., Remazeilles M., Renzi A., Rocha G., Rosset C., Roudier G., Rubino-Martin J.A., Ruiz-Granados B., Salvati L., Sandri M., Savelainen M., Scott D., Sirignano C., Sunyaev R., Suur-Uski A.-S., Tauber J.A., Tavagnacco D., Tenti M., Toffolatti L., Tomasi M., Trombetti T., Valiviita J., Van Tent B., Vielva P., Villa F., Vittorio N., Wandelt B.D., Wehus I.K., White M., White S.D.M., Zacchei A., Zonca A., Department of Physics, Helsinki Institute of Physics, Centre National de la Recherche Scientifique (CNRS)-Université de Paris (UP)-Sorbonne Université (SU)-École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Université de Paris (UP)-Sorbonne Université (SU)-École normale supérieure - Paris (ENS Paris), Institut national des sciences de l'Univers (INSU - CNRS)-Université Toulouse III - Paul Sabatier (UT3), Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Centre National de la Recherche Scientifique (CNRS), University of Parma = Università degli studi di Parma [Parme, Italie], Università degli Studi di Roma 'La Sapienza' = Sapienza University [Rome], Université Fédérale Toulouse Midi-Pyrénées, Sorbonne Université (SU)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université de Cergy Pontoise (UCP), Université Paris-Seine-Université Paris-Seine-Observatoire de Paris, Universita degli Studi di Padova, Laboratoire de physique de l'ENS - ENS Paris (LPENS (UMR_8023)), École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université de Paris (UP)-École normale supérieure - Paris (ENS Paris), and Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université de Paris (UP)
Subjects: Cosmological parameter, Cosmology and Nongalactic Astrophysics (astro-ph.CO), Large-scale structure of Universe, Astronomy, Cosmic microwave background, Cosmological parameters, Cosmic background radiation, FOS: Physical sciences, Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, Cosmology: observation, 01 natural sciences, 7. Clean energy, NO, symbols.namesake, Settore FIS/05 - Astronomia e Astrofisica, HALO-MODEL, Cosmic background radiation, Cosmological parameters, Cosmology: observations, Gravitational lensing: weak, Large-scale structure of Universe, Gravitational lensing: weak, Cosmic infrared background, 0103 physical sciences, Cosmology: observations, Planck, observations [Cosmology], 010303 astronomy & astrophysics, QB, Physics, Settore FIS/05, 010308 nuclear & particles physics, POWER SPECTRA, Spectral density, Astronomy and Astrophysics, 115 Astronomy, Space science, Redshift, GALAXIES, Gravitational lens, Space and Planetary Science, CROSS-CORRELATION, Dark energy, symbols, astro-ph.CO, DARK ENERGY, weak [Gravitational lensing], [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph], Astrophysics - Cosmology and Nongalactic Astrophysics
Abstract: Planck Collaboration: et al., arXiv:1807.06210v2, We present measurements of the cosmic microwave background (CMB) lensing potential using the final Planck 2018 temperature and polarization data. Using polarization maps filtered to account for the noise anisotropy, we increase the significance of the detection of lensing in the polarization maps from 5σ to 9σ. Combined with temperature, lensing is detected at 40σ. We present an extensive set of tests of the robustness of the lensing-potential power spectrum, and construct a minimum-variance estimator likelihood over lensing multipoles 8 ≤ L ≤ 400 (extending the range to lower L compared to 2015), which we use to constrain cosmological parameters. We find good consistency between lensing constraints and the results from the Planck CMB power spectra within the ΛCDM model. Combined with baryon density and other weak priors, the lensing analysis alone constrains σ8Ωm0.25 = 0.589 ± 0.020 (1σ errors). Also combining with baryon acoustic oscillation data, we find tight individual parameter constraints, σ8 = 0.811 ± 0.019, H0 = 67.9−1.3+1.2 km s−1 Mpc−1, and Ωm = 0.303−0.018+0.016. Combining with Planck CMB power spectrum data, we measure σ8 to better than 1% precision, finding σ8 = 0.811 ± 0.006. CMB lensing reconstruction data are complementary to galaxy lensing data at lower redshift, having a different degeneracy direction in σ8 − Ωm space; we find consistency with the lensing results from the Dark Energy Survey, and give combined lensing-only parameter constraints that are tighter than joint results using galaxy clustering. Using the Planck cosmic infrared background (CIB) maps as an additional tracer of high-redshift matter, we make a combined Planck-only estimate of the lensing potential over 60% of the sky with considerably more small-scale signal. We additionally demonstrate delensing of the Planck power spectra using the joint and individual lensing potential estimates, detecting a maximum removal of 40% of the lensing-induced power in all spectra. The improvement in the sharpening of the acoustic peaks by including both CIB and the quadratic lensing reconstruction is detected at high significance., Support is acknowledged from the European Research Council under the European Union’s Seventh Framework Programme (FP/2007-2013)/ERC Grant Agreement No. [616170], and from the Science and Technology Facilities Council [grant numbers ST/L000652/1 and ST/N000927/1, respectively]. The Planck Collaboration acknowledges the support of: ESA; CNES, and CNRS/INSU-IN2P3-INP (France); ASI, CNR, and INAF (Italy); NASA and DoE (USA); STFC and UKSA (UK); CSIC, MINECO, JA, and RES (Spain); Tekes, AoF, and CSC (Finland); DLR and MPG (Germany); CSA (Canada); DTU Space (Denmark); SER/SSO (Switzerland); RCN (Norway); SFI (Ireland); FCT/MCTES (Portugal); ERC and PRACE (EU).
Published: 2018
Full Text: View/download PDF

12. Planck 2013 results. XX. Cosmology from Sunyaev-Zeldovich cluster counts

Author: F. Villa, D. Santos, D. L. Harrison, Michele Liguori, Y. Giraud-Héraud, Marc-Antoine Miville-Deschênes, L. Montier, Michael P. Hobson, K. Ganga, Davide Maino, M. Ashdown, H. K. Eriksen, E. Martínez-González, Laura Bonavera, Federico Nati, X. Dupac, Jose M. Diego, R. V. Sudiwala, A. Renzi, Marc Türler, Pavel Naselsky, R. J. Davis, Jean-Baptiste Melin, J.-M. Lamarre, I. Ristorcelli, C. Hernández-Monteagudo, I. D. Novikov, M. Piat, A. Chamballu, R. Kneissl, A. de Rosa, Luca Terenzi, C. Combet, E. Franceschi, Anthony Challinor, Jörg P. Rachen, J. J. Bock, Nicola Bartolo, Monique Arnaud, G. Prézeau, A. Coulais, Jean-François Cardoso, F. Piacentini, Michael Seiffert, Duncan Hanson, Locke D. Spencer, Jose Alberto Rubino-Martin, T. J. Pearson, Richard A. Battye, B. Comis, M. Frailis, A.-S. Suur-Uski, J.-F. Sygnet, F. Cuttaia, Charles R. Lawrence, P. M. McGehee, Matthieu Roman, G. de Zotti, Carlo Baccigalupi, François Levrier, E. Hivon, Olivier Doré, J.-P. Bernard, C. Renault, V. Stolyarov, W. A. Holmes, L. Toffolatti, T. R. Jaffe, J.-L. Puget, Andrea Zonca, Anne Lähteenmäki, Hans Ulrik Nørgaard-Nielsen, Benjamin D. Wandelt, A. Gregorio, Luca Valenziano, Anna Bonaldi, R. B. Barreiro, Martin Kunz, P. Vielva, P. B. Lilje, A. Zacchei, Mathieu Remazeilles, Julian Borrill, S. Galeotta, A. Benoit-Lévy, Anthony Lasenby, M. Bucher, Douglas Scott, Jochen Weller, R. C. Butler, M. Migliaccio, M. Giard, F. Noviello, H. C. Chiang, Aurelien A. Fraisse, Guilaine Lagache, Peter Meinhold, F. Elsner, P. de Bernardis, F. Pajot, S. Galli, B. P. Crill, E. Keihänen, Marian Douspis, Jon E. Gudmundsson, L. Pagano, M. López-Caniego, Jussi Valiviita, Krzysztof M. Gorski, Peter G. Martin, A. Frejsel, Sabino Matarrese, Valeria Pettorino, Simon Prunet, François R. Bouchet, G. Hurier, P. Bielewicz, N. Mandolesi, Matthieu Tristram, P. R. Christensen, J. González-Nuevo, Fabio Pasian, Alain Benoit, L. Popa, J. Aumont, James R. Fergusson, Rafael Rebolo, Francesca Perrotta, A. Curto, Daniel J. Mortlock, A. Ducout, Davide Pietrobon, Ingunn Kathrine Wehus, M. Tucci, Silvia Masi, Jacques Delabrouille, B. Van Tent, G. W. Pratt, Carol Anne Oxborrow, E. Falgarone, Torsten A. Enßlin, Erminia Calabrese, A. J. Banday, Stéphane Colombi, E. Battaner, Gianluca Morgante, Elena Pierpaoli, Andrew H. Jaffe, G. Umana, Klaus Dolag, Massimiliano Lattanzi, Calvin B. Netterfield, Adam Moss, J. Lesgourgues, J. F. Macías-Pérez, Radek Stompor, Philip Lubin, Mika Juvela, Martin Reinecke, Graca Rocha, R. Leonardi, J. A. Murphy, Olivier Forni, A. Moneti, F. K. Hansen, Fabio Finelli, James G. Bartlett, F.-X. Désert, Sophie Henrot-Versille, Peter A. R. Ade, F. Couchot, M. Rossetti, Paolo Natoli, D. Yvon, L. Perotto, C. Rosset, G. Polenta, M. Linden-Vørnle, Sarah E. Church, L. P. L. Colombo, Dmitry Novikov, L. A. Wade, Daniela Paoletti, Dipak Munshi, George Efstathiou, Michele Maris, Subhabrata Mitra, J. A. Tauber, M. Savelainen, M. Tomasi, Marco Bersanelli, Stéphane Plaszczynski, Luigi Danese, E. P. S. Shellard, M. Sandri, Reijo Keskitalo, O. Perdereau, H. Dole, Theodore Kisner, J. Knoche, Allan Hornstrup, Etienne Pointecouteau, S. R. Hildebrandt, Carlo Burigana, L. Mendes, D. Sutton, J. Tuovinen, R. A. Sunyaev, R. D. Davies, K. Benabed, J. R. Bond, E. Gjerløw, Hannu Kurki-Suonio, Steven Gratton, David L. Clements, Kevin M. Huffenberger, G. Roudier, W. C. Jones, Alessandro Gruppuso, S. Donzelli, W. Hovest, B. Partridge, Giorgio Savini, A. Catalano, Ranga-Ram Chary, A. Mennella, Nabila Aghanim, Simon D. M. White, Alessandro Melchiorri, A. Mangilli, Gianmarco Maggio, Ben Rusholme, D. Herranz, G. Patanchon, F. Paci, APC - Cosmologie, AstroParticule et Cosmologie (APC (UMR_7164)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Hélium : du fondamental aux applications (NEEL - HELFA), Institut Néel (NEEL), Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Centre National de la Recherche Scientifique (CNRS), Laboratoire d'Etude du Rayonnement et de la Matière en Astrophysique (LERMA), École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université de Cergy Pontoise (UCP), Université Paris-Seine-Université Paris-Seine-Centre National de la Recherche Scientifique (CNRS), Laboratoire de l'Accélérateur Linéaire (LAL), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), APC - Gravitation (APC-Gravitation), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)-Max-Planck-Institut für Gravitationsphysik ( Albert-Einstein-Institut ) (AEI), Max-Planck-Gesellschaft-Max-Planck-Gesellschaft, PLANCK, Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Hélium : du fondamental aux applications (HELFA), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Joseph Fourier - Grenoble 1 (UJF)-Centre National de la Recherche Scientifique (CNRS), École normale supérieure - Paris (ENS Paris), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Max-Planck-Institut für Gravitationsphysik ( Albert-Einstein-Institut ) (AEI), Department of Physics, Helsinki Institute of Physics, Physique Corpusculaire et Cosmologie - Collège de France (PCC), Collège de France (CdF)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Collège de France (CdF)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-AstroParticule et Cosmologie (APC (UMR_7164)), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Observatoire de Paris, PSL Research University (PSL)-PSL Research University (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Observatoire de Paris, PSL Research University (PSL)-PSL Research University (PSL)-Université Paris Diderot - Paris 7 (UPD7), HELFA - Hélium : du fondamental aux applications, Université Grenoble Alpes (UGA)-Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF)-Université Grenoble Alpes (UGA)-Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF), Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA), PSL Research University (PSL)-PSL Research University (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Observatoire de Paris, PSL Research University (PSL)-PSL Research University (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Max-Planck-Institut für Gravitationsphysik ( Albert-Einstein-Institut ) (AEI), Science and Technology Facilities Council (STFC), Science and Technology Facilities Council [2006-2012], Tauber, Jan, Ade, P. A. R., Aghanim, N., Armitage Caplan, C., Arnaud, M., Ashdown, M., Atrio Barandela, F., Aumont, J., Baccigalupi, C., Banday, A. J., Barreiro, R. B., Barrena, R., Bartlett, J. G., Battaner, E., Battye, R., Benabed, K., Benoît, A., Benoit Lévy, A., Bernard, J. P., Bersanelli, M., Bielewicz, P., Bikmaev, I., Blanchard, A., Bobin, J., Bock, J. J., Böhringer, H., Bonaldi, A., Bond, J. R., Borrill, J., Bouchet, F. R., Bourdin, H., Bridges, M., Brown, M. L., Bucher, M., Burenin, R., Burigana, C., Butler, R. C., Cardoso, J. F., Carvalho, P., Catalano, A., Challinor, A., Chamballu, A., Chary, R. R., Chiang, L. Y., Chiang, H. C., Chon, G., Christensen, P. R., Church, S., Clements, D. L., Colombi, S., Colombo, L. P. L., Couchot, F., Coulais, A., Crill, B. P., Curto, A., Cuttaia, F., Da Silva, A., Dahle, H., Danese, L., Davies, R. D., Davis, R. J., De Bernardis, P., De Rosa, A., De Zotti, G., Delabrouille, J., Delouis, J. M., Démoclès, J., Désert, F. X., Dickinson, C., Diego, J. M., Dolag, K., Dole, H., Donzelli, S., Doré, O., Douspis, M., Dupac, X., Efstathiou, G., Enßlin, T. A., Eriksen, H. K., Finelli, F., Flores Cacho, I., Forni, O., Frailis, M., Franceschi, E., Fromenteau, S., Galeotta, S., Ganga, K., Génova Santos, R. T., Giard, M., Giardino, G., Giraud Héraud, Y., González Nuevo, J., Górski, K. M., Gratton, S., Gregorio, Anna, Gruppuso, A., Hansen, F. K., Hanson, D., Harrison, D., Henrot Versillé, S., Hernández Monteagudo, C., Herranz, D., Hildebrandt, S. R., Hivon, E., Hobson, M., Holmes, W. A., Hornstrup, A., Hovest, W., Huffenberger, K. M., Hurier, G., Jaffe, T. R., Jaffe, A. H., Jones, W. C., Juvela, M., Keihänen, E., Keskitalo, R., Khamitov, I., Kisner, T. S., Kneissl, R., Knoche, J., Knox, L., Kunz, M., Kurki Suonio, H., Lagache, G., Lähteenmäki, A., Lamarre, J. M., Lasenby, A., Laureijs, R. J., Lawrence, C. R., Leahy, J. P., Leonardi, R., León Tavares, J., Lesgourgues, J., Liddle, A., Liguori, M., Lilje, P. B., Linden Vørnle, M., López Caniego, M., Lubin, P. M., Maciás Pérez, J. F., Maffei, B., Maino, D., Mandolesi, N., Marcos Caballero, A., Maris, M., Marshall, D. J., Martin, P. G., Martínez González, E., Masi, S., Matarrese, S., Matthai, F., Mazzotta, P., Meinhold, P. R., Melchiorri, A., Melin, J. B., Mendes, L., Mennella, A., Migliaccio, M., Mitra, S., Miville Deschênes, M. A., Moneti, A., Montier, L., Morgante, G., Mortlock, D., Moss, A., Munshi, D., Naselsky, P., Nati, F., Natoli, P., Netterfield, C. B., Nørgaard Nielsen, H. U., Noviello, F., Novikov, D., Novikov, I., Osborne, S., Oxborrow, C. A., Paci, F., Pagano, L., Pajot, F., Paoletti, D., Partridge, B., Pasian, F., Patanchon, G., Perdereau, O., Perotto, L., Perrotta, F., Piacentini, F., Piat, M., Pierpaoli, E., Pietrobon, D., Plaszczynski, S., Pointecouteau, E., Polenta, G., Ponthieu, N., Popa, L., Poutanen, T., Pratt, G. W., Prézeau, G., Prunet, S., Puget, J. L., Rachen, J. P., Rebolo, R., Reinecke, M., Remazeilles, M., Renault, C., Ricciardi, S., Riller, T., Ristorcelli, I., Rocha, G., Roman, M., Rosset, C., Roudier, G., Rowan Robinson, M., Rubinõ Martín, J. A., Rusholme, B., Sandri, M., Santos, D., Savini, G., Scott, D., Seiffert, M. D., Shellard, E. P. S., Spencer, L. D., Starck, J. L., Stolyarov, V., Stompor, R., Sudiwala, R., Sunyaev, R., Sureau, F., Sutton, D., Suur Uski, A. S., Sygnet, J. F., Tauber, J. A., Tavagnacco, Daniele, Terenzi, L., Toffolatti, L., Tomasi, M., Tristram, M., Tucci, M., Tuovinen, J., Türler, M., Umana, G., Valenziano, L., Valiviita, J., Van Tent, B., Vielva, P., Villa, F., Vittorio, N., Wade, L. A., Wandelt, B. D., Weller, J., White, M., White, S. D. M., Yvon, D., Zacchei, A., Zonca, A., Tauber, J, Ade, P, Aghanim, N, Armitage Caplan, C, Arnaud, M, Ashdown, M, Atrio Barandela, F, Aumont, J, Baccigalupi, C, Banday, A, Barreiro, R, Barrena, R, Bartlett, J, Battaner, E, Battye, R, Benabed, K, Benoît, A, Benoit Lévy, A, Bernard, J, Bersanelli, M, Bielewicz, P, Bikmaev, I, Blanchard, A, Bobin, J, Bock, J, Böhringer, H, Bonaldi, A, Bond, J, Borrill, J, Bouchet, F, Bourdin, H, Bridges, M, Brown, M, Bucher, M, Burenin, R, Burigana, C, Butler, R, Cardoso, J, Carvalho, P, Catalano, A, Challinor, A, Chamballu, A, Chary, R, Chiang, L, Chiang, H, Chon, G, Christensen, P, Church, S, Clements, D, Colombi, S, Colombo, L, Couchot, F, Coulais, A, Crill, B, Curto, A, Cuttaia, F, Da Silva, A, Dahle, H, Danese, L, Davies, R, Davis, R, DE BERNARDIS, P, De Rosa, A, De Zotti, G, Delabrouille, J, Delouis, J, Démoclès, J, Désert, F, Dickinson, C, Diego, J, Dolag, K, Dole, H, Donzelli, S, Doré, O, Douspis, M, Dupac, X, Efstathiou, G, Enßlin, T, Eriksen, H, Finelli, F, Flores Cacho, I, Forni, O, Frailis, M, Franceschi, E, Fromenteau, S, Galeotta, S, Ganga, K, Génova Santos, R, Giard, M, Giardino, G, Giraud Héraud, Y, González Nuevo, J, Górski, K, Gratton, S, Gregorio, A, Gruppuso, A, Hansen, F, Hanson, D, Harrison, D, Henrot Versillé, S, Hernández Monteagudo, C, Herranz, D, Hildebrandt, S, Hivon, E, Hobson, M, Holmes, W, Hornstrup, A, Hovest, W, Huffenberger, K, Hurier, G, Jaffe, T, Jaffe, A, Jones, W, Juvela, M, Keihänen, E, Keskitalo, R, Khamitov, I, Kisner, T, Kneissl, R, Knoche, J, Knox, L, Kunz, M, Kurki Suonio, H, Lagache, G, Lähteenmäki, A, Lamarre, J, Lasenby, A, Laureijs, R, Lawrence, C, Leahy, J, Leonardi, R, León Tavares, J, Lesgourgues, J, Liddle, A, Liguori, M, Lilje, P, Linden Vørnle, M, López Caniego, M, Lubin, P, Maciás Pérez, J, Maffei, B, Maino, D, Mandolesi, N, Marcos Caballero, A, Maris, M, Marshall, D, Martin, P, Martínez González, E, Masi, S, Matarrese, S, Matthai, F, Mazzotta, P, Meinhold, P, Melchiorri, A, Melin, J, Mendes, L, Mennella, A, Migliaccio, M, Mitra, S, Miville Deschênes, M, Moneti, A, Montier, L, Morgante, G, Mortlock, D, Moss, A, Munshi, D, Naselsky, P, Nati, F, Natoli, P, Netterfield, C, Nørgaard Nielsen, H, Noviello, F, Novikov, D, Novikov, I, Osborne, S, Oxborrow, C, Paci, F, Pagano, L, Pajot, F, Paoletti, D, Partridge, B, Pasian, F, Patanchon, G, Perdereau, O, Perotto, L, Perrotta, F, Piacentini, F, Piat, M, Pierpaoli, E, Pietrobon, D, Plaszczynski, S, Pointecouteau, E, Polenta, G, Ponthieu, N, Popa, L, Poutanen, T, Pratt, G, Prézeau, G, Prunet, S, Puget, J, Rachen, J, Rebolo, R, Reinecke, M, Remazeilles, M, Renault, C, Ricciardi, S, Riller, T, Ristorcelli, I, Rocha, G, Roman, M, Rosset, C, Roudier, G, Rowan Robinson, M, Rubinõ Martín, J, Rusholme, B, Sandri, M, Santos, D, Savini, G, Scott, D, Seiffert, M, Shellard, E, Spencer, L, Starck, J, Stolyarov, V, Stompor, R, Sudiwala, R, Sunyaev, R, Sureau, F, Sutton, D, Suur Uski, A, Sygnet, J, Tavagnacco, D, Terenzi, L, Toffolatti, L, Tomasi, M, Tristram, M, Tucci, M, Tuovinen, J, Türler, M, Umana, G, Valenziano, L, Valiviita, J, Van Tent, B, Vielva, P, Villa, F, Vittorio, N, Wade, L, Wandelt, B, Weller, J, White, M, White, S, Yvon, D, Zacchei, A, and Zonca, A
Subjects: Cosmological parameter, Large-scale structure of Universe, NONTHERMAL PRESSURE, HYDRODYNAMIC SIMULATIONS, [SDU.ASTR.CO]Sciences of the Universe [physics]/Astrophysics [astro-ph]/Cosmology and Extra-Galactic Astrophysics [astro-ph.CO], Astronomy, Cosmic microwave background, Astrophysics, clusters: general [Galaxies], 7. Clean energy, Cosmology, galaxies, MASSIVE GALAXY CLUSTERS, Physics, Astrophysics::Instrumentation and Methods for Astrophysics, universe, Computer Science::Computers and Society, South Pole Telescope, galaxies: clusters: general, Physical Sciences, Physics::Space Physics, astro-ph.CO, ComputingMethodologies_DOCUMENTANDTEXTPROCESSING, symbols, Baryon acoustic oscillations, large-scale structure of Universe, X-RAY-PROPERTIES, Astrophysics - Cosmology and Nongalactic Astrophysics, Cosmology and Nongalactic Astrophysics (astro-ph.CO), Cosmological parameters, Galaxies: clusters: general, Astronomy and Astrophysics, Space and Planetary Science, education, FOS: Physical sciences, Astrophysics::Cosmology and Extragalactic Astrophysics, Astronomy & Astrophysics, Computer Science::Digital Libraries, NO, [PHYS.ASTR.CO]Physics [physics]/Astrophysics [astro-ph]/Cosmology and Extra-Galactic Astrophysics [astro-ph.CO], symbols.namesake, Settore FIS/05 - Astronomia e Astrofisica, LARGE-SCALE STRUCTURE, Planck, cosmological parameters, SPT-SZ SURVEY, XMM-NEWTON, Science & Technology, SOUTH-POLE TELESCOPE, Astronomy and Astrophysic, 115 Astronomy, Space science, Redshift, 0201 Astronomical And Space Sciences, Gravitational lens, DIGITAL SKY SURVEY, BARYON ACOUSTIC-OSCILLATIONS, Hubble's law
Abstract: We present constraints on cosmological parameters using number counts as a function of redshift for a sub-sample of 189 galaxy clusters from the Planck SZ (PSZ) catalogue. The PSZ is selected through the signature of the Sunyaev-Zeldovich (SZ) effect, and the sub-sample used here has a signal-to-noise threshold of seven, with each object confirmed as a cluster and all but one with a redshift estimate. We discuss the completeness of the sample and our construction of a likelihood analysis. Using a relation between mass M and SZ signal Y calibrated to X-ray measurements, we derive constraints on the power spectrum amplitude σ8 and matter density parameter Ωm in a flat ΛCDM model. We test the robustness of our estimates and find that possible biases in the Y-M relation and the halo mass function are larger than the statistical uncertainties from the cluster sample. Assuming the X-ray determined mass to be biased low relative to the true mass by between zero and 30%, motivated by comparison of the observed mass scaling relations to those from a set of numerical simulations, we find that σ8 = 0.75 ± 0.03, Ωm = 0.29 ± 0.02, and σ8(Ωm/0.27)0.3 = 0.764 ± 0.025. The value of σ8 is degenerate with the mass bias; if the latter is fixed to a value of 20% (the central value from numerical simulations) we find σ8 (Ωm/0.27)0.3 = 0.78 ± 0.01 and a tighter one-dimensional range σ8 = 0.77 ± 0.02. We find that the larger values of σ8 and Ωm preferred by Planck's measurements of the primary CMB anisotropies can be accommodated by a mass bias of about 40%. Alternatively, consistency with the primary CMB constraints can be achieved by inclusion of processes that suppress power on small scales relative to the ΛCDM model, such as a component of massive neutrinos. We place our results in the context of other determinations of cosmologicalparameters, and discuss issues that need to be resolved in order to make further progress in this field., The development of Planck has been supported by: ESA; CNES and CNRS/INSU-IN2P3-INP (France); ASI, CNR, and INAF (Italy); NASA and DoE (USA); STFC and UKSA (UK); CSIC, MICINN and JA (Spain); Tekes, AoF and CSC (Finland); DLR and MPG (Germany); CSA (Canada); DTU Space (Denmark); SER/SSO (Switzerland); RCN (Norway); SFI (Ireland); FCT/MCTES (Portugal); and PRACE (EU).
Published: 2013
Full Text: View/download PDF

13. Path Integral for Stochastic Inflation: Non-Perturbative Volume Weighting, Complex Histories, Initial Conditions and the End of Inflation

Author: Steven Gratton
Subjects: Physics, Inflation, High Energy Physics - Theory, Nuclear and High Energy Physics, Cosmology and Nongalactic Astrophysics (astro-ph.CO), media_common.quotation_subject, Measure (physics), FOS: Physical sciences, Astrophysics::Cosmology and Extragalactic Astrophysics, Inflaton, Weighting, Theoretical physics, General Relativity and Quantum Cosmology, High Energy Physics - Theory (hep-th), Quartic function, Path integral formulation, Proper time, Applied mathematics, Complex plane, media_common, Astrophysics - Cosmology and Nongalactic Astrophysics
Abstract: In this paper we present a path integral formulation of stochastic inflation, in which volume weighting can easily be implemented. With an in-depth study of inflation in a quartic potential, we investigate how the inflaton evolves and how inflation typically ends both with and without volume weighting. Perhaps unexpectedly, complex histories sometimes emerge with volume weighting. The reward for this excursion into the complex plane is an insight into how volume-weighted inflation both loses memory of initial conditions and ends via slow-roll. The slow-roll end of inflation mitigates certain "Youngness Paradox"-type criticisms of the volume-weighted paradigm. Thus it is perhaps time to rehabilitate proper time volume weighting as a viable measure for answering at least some interesting cosmological questions., 8 pages, 4 figures
Published: 2010

14. B-mode Detection with an Extended Planck Mission

Author: Steven Gratton and George Efstathiou
Subjects: Physics, Cosmology and Nongalactic Astrophysics (astro-ph.CO), Frequency band, media_common.quotation_subject, Astrophysics::Instrumentation and Methods for Astrophysics, FOS: Physical sciences, Astronomy, Astronomy and Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, symbols.namesake, Sky, symbols, Astrophysics::Earth and Planetary Astrophysics, Planck, Astrophysics::Galaxy Astrophysics, Dust emission, media_common, Astrophysics - Cosmology and Nongalactic Astrophysics
Abstract: The Planck satellite has a nominal mission lifetime of 14 months allowing two complete surveys of the sky. Here we investigate the potential of an extended Planck mission of four sky surveys to constrain primordial B-mode anisotropies in the presence of dominant Galactic polarized foreground emission. An extended Planck mission is capable of powerful constraints on primordial B-modes at low multipoles, which cannot be probed by ground based or sub-orbital experiments. A tensor-scalar ratio of r=0.05 can be detected at a high significance level by an extended Planck mission and it should be possible to set a 95% upper limit on r of 0.03 if the tensor-scalar ratio is vanishingly small. Furthermore, extending the Planck mission to four sky surveys offers better control of polarized Galactic dust emission, since the 217 GHz frequency band can be used as an effective dust template in addition to the 353 GHz channel., 10 pages, 3 figures
Published: 2009

15. Impact of Galactic polarized emission on B-mode detection at low multipoles

Author: Steven Gratton, George Efstathiou, and Francesco Paci
Subjects: Physics, Offset (computer science), Cosmology and Nongalactic Astrophysics (astro-ph.CO), Pixel, Subtraction, FOS: Physical sciences, Astronomy and Astrophysics, Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, Polarization (waves), Computational physics, symbols.namesake, Template, Space and Planetary Science, symbols, Planck, Linear combination, Likelihood function, Astrophysics - Cosmology and Nongalactic Astrophysics
Abstract: We use a model of polarized Galactic emission developed by the the Planck collaboration to assess the impact of foregrounds on B-mode detection at low multipoles. Our main interest is to applications of noisy polarization data and in particular to assessing the feasibility of B-mode detection by Planck. This limits the complexity of foreground subtraction techniques that can be applied to the data. We analyze internal linear combination techniques and show that the offset caused by the dominant E-mode polarization pattern leads to a fundamental limit of r approximately 0.1 for the tensor-scalar ratio even in the absence of instrumental noise. We devise a simple, robust, template fitting technique using multi-frequency polarization maps. We show that template fitting using Planck data alone offers a feasible way of recovering primordial B-modes from dominant foreground contamination, even in the presence of noise on the data and templates. We implement and test a pixel-based scheme for computing the likelihood function of cosmological parameters at low multipoles that incorporates foreground subtraction of noisy data., 20 pages, 10 figures
Published: 2009

16. Prospects for Constraining Neutrino Mass Using Planck and Lyman-Alpha Forest Data

Author: George Efstathiou, Antony Lewis, and Steven Gratton
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Oscillation, Astrophysics (astro-ph), Cosmic background radiation, Spectral density, FOS: Physical sciences, Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, Lyman-alpha forest, Cosmology, symbols.namesake, symbols, Neutrino, Planck, Neutrino oscillation
Abstract: In this paper we investigate how well Planck and Lyman-Alpha forest data will be able to constrain the sum of the neutrino masses, and thus, in conjunction with flavour oscillation experiments, be able to determine the absolute masses of the neutrinos. It seems possible that Planck, together with a Lyman-Alpha survey, will be able to put pressure on an inverted hierarchial model for the neutrino masses. However, even for optimistic assumptions of the precision of future Lyman-Alpha datasets, it will not be possible to confirm a minimal-mass normal hierarchy., 6 pages, 4 figures
Published: 2007

17. Measures on transitions for cosmology from eternal inflation

Author: Matthew C. Johnson, Steven Gratton, and Anthony Aguirre
Subjects: Physics, Inflation (cosmology), High Energy Physics - Theory, FOS: Physical sciences, General Physics and Astronomy, Observable, Context (language use), Astrophysics::Cosmology and Extragalactic Astrophysics, Measure (mathematics), Cosmology, String theory landscape, Theoretical physics, High Energy Physics::Theory, General Relativity and Quantum Cosmology, Classical mechanics, High Energy Physics - Theory (hep-th), Quantum cosmology, Eternal inflation
Abstract: We argue that in the context of eternal inflation in the landscape, making predictions for cosmological -- and possibly particle physics -- observables requires a measure on the possible cosmological histories as opposed to one on the vacua themselves. If significant slow-roll inflation occurs, the observables are generally determined by the history after the last transition between metastable vacua. Hence we start from several existing measures for counting vacua and develop measures for counting the transitions between vacua., 4 pages, 1 figures, accepted to PRL; minor changes to match published version
Published: 2007

18. Hurdles for Recent Measures in Eternal Inflation

Author: Steven Gratton, Matthew C. Johnson, and Anthony Aguirre
Subjects: Physics, Inflation (cosmology), High Energy Physics - Theory, Nuclear and High Energy Physics, Astrophysics (astro-ph), FOS: Physical sciences, General Relativity and Quantum Cosmology (gr-qc), Astrophysics, General Relativity and Quantum Cosmology, Boltzmann brain, Theoretical physics, High Energy Physics - Theory (hep-th), Quantum cosmology, Inflationary epoch, Mathematical economics, Eternal inflation
Abstract: In recent literature on eternal inflation, a number of measures have been introduced which attempt to assign probabilities to different pocket universes by counting the number of each type of pocket according to a specific procedure. We give an overview of the existing measures, pointing out some interesting connections and generic predictions. For example, pairs of vacua that undergo fast transitions between themselves will be strongly favored. The resultant implications for making predictions in a generic potential landscape are discussed. We also raise a number of issues concerning the types of transitions that observers in eternal inflation are able to experience., 15 PRD-style pages, 5 figures, expanded discussion of measures in Sec. II, added references
Published: 2006

19. Cosmic Perturbations Through the Cyclic Ages

Author: Paul J. Steinhardt, Neil Turok, Steven Gratton, and Joel K. Erickson
Subjects: High Energy Physics - Theory, Inflation (cosmology), Physics, Cyclic model, Big Bang, Nuclear and High Energy Physics, 010308 nuclear & particles physics, media_common.quotation_subject, Astrophysics (astro-ph), FOS: Physical sciences, Astrophysics, 01 natural sciences, Universe, Particle horizon, Ekpyrotic universe, General Relativity and Quantum Cosmology, Classical mechanics, High Energy Physics - Theory (hep-th), De Sitter universe, 0103 physical sciences, 010306 general physics, Flatness problem, media_common
Abstract: We analyze the evolution of cosmological perturbations in the cyclic model, paying particular attention to their behavior and interplay over multiple cycles. Our key results are: (1) galaxies and large scale structure present in one cycle are generated by the quantum fluctuations in the preceding cycle without interference from perturbations or structure generated in earlier cycles and without interfering with structure generated in later cycles; (2) the ekpyrotic phase, an epoch of gentle contraction with equation of state $w\gg 1$ preceding the hot big bang, makes the universe homogeneous, isotropic and flat within any given observer's horizon; and, (3) although the universe is uniform within each observer's horizon, the global structure of the cyclic universe is more complex, owing to the effects of superhorizon length perturbations, and cannot be described in a uniform Friedmann-Robertson-Walker picture. In particular, we show that the ekpyrotic phase is so effective in smoothing, flattening and isotropizing the universe within the horizon that this phase alone suffices to solve the horizon and flatness problems even without an extended period of dark energy domination (a kind of low energy inflation). Instead, the cyclic model rests on a genuinely novel, non-inflationary mechanism (ekpyrotic contraction) for resolving the classic cosmological conundrums., Comment: 28 pages, 5 figures, 1 table
Published: 2006
Full Text: View/download PDF

20. Langevin analysis of eternal inflation

Author: Neil Turok and Steven Gratton
Subjects: High Energy Physics - Theory, Physics, Inflation (cosmology), Nuclear and High Energy Physics, Stochastic process, Astrophysics (astro-ph), FOS: Physical sciences, General Relativity and Quantum Cosmology (gr-qc), Astrophysics::Cosmology and Extragalactic Astrophysics, Inflaton, Astrophysics, General Relativity and Quantum Cosmology, Cosmology, Weighting, Theoretical physics, symbols.namesake, High Energy Physics - Theory (hep-th), symbols, Eternal inflation, Quantum fluctuation, Hubble's law
Abstract: It has been widely claimed that inflation is generically eternal to the future, even in models where the inflaton potential monotonically increases away from its minimum. The idea is that quantum fluctuations allow the field to jump uphill, thereby continually revitalizing the inflationary process in some regions. In this paper we investigate a simple model of this process, pertaining to inflation with a quartic potential, in which analytic progress may be made. We calculate several quantities of interest, such as the expected number of inflationary efolds, first without and then with various selection effects. With no additional weighting, the stochastic noise has little impact on the total number of inflationary efoldings even if the inflaton starts with a Planckian energy density. A "rolling" volume factor, i.e. weighting in proportion to the volume at that time, also leads to a monotonically decreasing Hubble constant and hence no eternal inflation. We show how stronger selection effects including a constraint on the initial and final states and weighting with the final volume factor can lead to a picture similar to that usually associated with eternal inflation., 22 pages, 2 figures
Published: 2005
Full Text: View/download PDF

21. Conditions for generating scale-invariant density perturbations

Author: Justin Khoury, Steven Gratton, Neil Turok, and Paul J. Steinhardt
Subjects: High Energy Physics - Theory, Physics, Inflation (cosmology), Nuclear and High Energy Physics, 010308 nuclear & particles physics, Equation of state (cosmology), Astrophysics (astro-ph), Spectrum (functional analysis), FOS: Physical sciences, Scale invariance, Approx, Astrophysics, 01 natural sciences, Ekpyrotic universe, Classical mechanics, High Energy Physics - Theory (hep-th), 0103 physical sciences, 010306 general physics, Scalar field, Quantum fluctuation, Mathematical physics
Abstract: We analyze the general conditions on the equation of state $w$ required for quantum fluctuations of a scalar field to produce a scale-invariant spectrum of density perturbations, including models which (in the four dimensional effective description) bounce from a contracting to an expanding phase. We show that there are only two robust cases: $w\approx -1$ (inflation) and $w \gg 1$ (the ekpyrotic/cyclic scenario). All other cases, including the $w \approx 0$ case considered by some authors, require extreme fine-tuning of initial conditions and/or the effective potential. For the ekpyrotic/cyclic ($w \gg 1$) case, we also analyze the small deviations from scale invariance., Comment: 6 pages, no figures
Published: 2004
Full Text: View/download PDF

22. Inflation without a beginning: a null boundary proposal

Author: Anthony Aguirre and Steven Gratton
Subjects: High Energy Physics - Theory, Physics, Inflation (cosmology), Nuclear and High Energy Physics, Quantum field theory in curved spacetime, Spacetime, media_common.quotation_subject, Astrophysics (astro-ph), Boundary (topology), Semiclassical physics, FOS: Physical sciences, General Relativity and Quantum Cosmology (gr-qc), Astrophysics, General Relativity and Quantum Cosmology, Universe, Theoretical physics, Classical mechanics, High Energy Physics - Theory (hep-th), De Sitter universe, Arrow of time, media_common
Abstract: We develop our recent suggestion that inflation may be made past eternal, so that there is no initial cosmological singularity or "beginning of time". Inflation with multiple vacua generically approaches a steady-state statistical distribution of regions at these vacua, and our model follows directly from making this distribution hold at all times. We find that this corresponds (at the semi-classical level) to particularly simple cosmological boundary conditions on an infinite null surface near which the spacetime looks de Sitter. The model admits an interesting arrow of time that is well-defined and consistent for all physical observers that can communicate, even while the statistical description of the entire universe admits a symmetry that includes time-reversal. Our model suggests, but does not require, the identification of antipodal points on the manifold. The resulting "elliptic" de Sitter spacetime has interesting classical and quantum properties. The proposal may be generalized to other inflationary potentials, or to boundary conditions that give semi-eternal but non-singular cosmologies., Comment: Minor revisions to match published version; 18 pages, 5 postscript figures
Published: 2003
Full Text: View/download PDF

23. Closed universes from cosmological instantons

Author: Antony Lewis, Neil Turok, and Steven Gratton
Subjects: High Energy Physics - Theory, Physics, Inflation (cosmology), Nuclear and High Energy Physics, Instanton, High Energy Physics::Lattice, media_common.quotation_subject, Astrophysics (astro-ph), Cosmic microwave background, Scalar (mathematics), FOS: Physical sciences, Gravitational instanton, General Relativity and Quantum Cosmology (gr-qc), Astrophysics::Cosmology and Extragalactic Astrophysics, Astrophysics, General Relativity and Quantum Cosmology, Universe, High Energy Physics::Theory, Theoretical physics, Classical mechanics, High Energy Physics - Theory (hep-th), De Sitter universe, Tensor, media_common
Abstract: Current observational data is consistent with the universe being slightly closed. We investigate families of singular and non-singular closed instantons that could describe the beginning of a closed inflationary universe. We calculate the scalar and tensor perturbations that would be generated from singular instantons and compute the corresponding CMB power spectrum in a universe with cosmological parameters like our own. We investigate spatially homogeneous modes of the instantons, finding unstable modes which render the instantons sub-dominant contributions in the path integral. We show that a suitable condition may be imposed on singular closed instantons, constraining their instabilities. With this constraint these instantons can provide a suitable model of the early universe, and predict CMB power spectra in close agreement with the predictions of slow-roll inflation., 12 pages, 6 figures
Published: 2002
Full Text: View/download PDF

24. Steady-State Eternal Inflation

Author: Steven Gratton and Anthony Aguirre
Subjects: Inflation (cosmology), Physics, High Energy Physics - Theory, Nuclear and High Energy Physics, Spacetime, De Sitter space, Initial singularity, media_common.quotation_subject, Astrophysics (astro-ph), FOS: Physical sciences, General Relativity and Quantum Cosmology (gr-qc), Astrophysics, Cosmology, Universe, General Relativity and Quantum Cosmology, Theoretical physics, High Energy Physics - Theory (hep-th), De Sitter universe, Eternal inflation, media_common
Abstract: Since the advent of inflation, several theorems have been proven suggesting that although inflation can (and generically does) continue eternally into the future, it cannot be extended eternally into the past to create a ``steady-state'' model with no initial time. Here we provide a construction that circumvents these theorems and allows a self-consistent, geodesically complete, and physically sensible steady-state eternally inflating universe, based on the flat slicing of de Sitter space. This construction could be used as the background space-time for creation events that form big-bang-like regions, and hence could form the basis for a cosmology that is compatible with observations and yet which avoids an initial singularity or beginning of time., Minor modifications to match version in Phys. Rev. D. 7 pages, 2 color figures
Published: 2001

25. Homogeneous Modes of Cosmological Instantons

Author: Neil Turok and Steven Gratton
Subjects: Physics, High Energy Physics - Theory, Nuclear and High Energy Physics, Instanton, Quantum field theory in curved spacetime, Spacetime, FOS: Physical sciences, Gravitational instanton, Euclidean quantum gravity, Gravitation, Theoretical physics, General Relativity and Quantum Cosmology, Classical mechanics, High Energy Physics - Theory (hep-th), Path integral formulation, Quantum gravity
Abstract: We discuss the O(4) invariant perturbation modes of cosmological instantons. These modes are spatially homogeneous in Lorentzian spacetime and thus not relevant to density perturbations. But their properties are important in establishing the meaning of the Euclidean path integral. If negative modes are present, the Euclidean path integral is not well defined, but may nevertheless be useful in an approximate description of the decay of an unstable state. When gravitational dynamics is included, counting negative modes requires a careful treatment of the conformal factor problem. We demonstrate that for an appropriate choice of coordinate on phase space, the second order Euclidean action is bounded below for normalized perturbations and has a finite number of negative modes. We prove that there is a negative mode for many gravitational instantons of the Hawking-Moss or Coleman-De Luccia type, and discuss the associated spectral flow. We also investigate Hawking-Turok constrained instantons, which occur in a generic inflationary model. Implementing the regularization and constraint proposed by Kirklin, Turok and Wiseman, we find that those instantons leading to substantial inflation do not possess negative modes. Using an alternate regularization and constraint motivated by reduction from five dimensions, we find a negative mode is present. These investigations shed new light on the suitability of Euclidean quantum gravity as a potential description of our universe., 16 pages, compressed and RevTex file, including one postscript figure file
Published: 2000

26. Cosmological perturbations from the no boundary Euclidean path integral

Author: Steven Gratton and Neil Turok
Subjects: Physics, Nuclear and High Energy Physics, Instanton, Quantum field theory in curved spacetime, Astrophysics (astro-ph), FOS: Physical sciences, Boundary (topology), General Relativity and Quantum Cosmology (gr-qc), Euclidean quantum gravity, Astrophysics, General Relativity and Quantum Cosmology, High Energy Physics - Phenomenology, High Energy Physics::Theory, High Energy Physics - Phenomenology (hep-ph), Quantum mechanics, Saddle point, Path integral formulation, Scalar field, Quantum fluctuation, Mathematical physics
Abstract: We compute, from first principles, the quantum fluctuations about instanton saddle points of the Euclidean path integral for Einstein gravity coupled to a scalar field. The Euclidean two-point correlator is analytically continued into the Lorentzian region where it describes the quantum mechanical vacuum fluctuations in the state described by no boundary proposal initial conditions. We concentrate on the density perturbations in open inflationary universes produced from cosmological instantons, describing the differences between non-singular Coleman-De Luccia and singular Hawking-Turok instantons. We show how the Euclidean path integral uniquely specifies the fluctuations in both cases., 21 pages, RevTex file, including five postscript figure files
Published: 1999
Full Text: View/download PDF

27. An Observational Test of Quantum Cosmology

Author: Thomas Hertog, Neil Turok, and Steven Gratton
Subjects: Physics, Nuclear and High Energy Physics, Instanton, Quantum field theory in curved spacetime, Astrophysics (astro-ph), Cosmic microwave background, FOS: Physical sciences, Observable, Astrophysics, Theoretical physics, Classical mechanics, Quantum cosmology, Multipole expansion, Scalar field, False vacuum
Abstract: We compute the tensor CMB anisotropy power spectrum for singular and non-singular instantons describing the beginning of an open universe according to the Euclidean no boundary proposal. Singular instantons occur generically, whereas non-singular instantons require more contrived scalar field potentials. For the latter, we consider potentials in which a sharp feature, either negative or positive, is added to a gently sloping potential. In the first case one finds a nearly divergent contribution to the low multipole CMB anisotropy, in conflict with the COBE observations. In the second case the divergence is weaker, but matching the low multipoles forces the added feature to be large and narrow. For singular instantons, there is a better match to the observations, without any such contrivance. The distinction between singular and nonsingular instantons disappears in the limit as the universe becomes flat, but is still observable for densities as high as 0.7 of the critical density., 15 pages RevTex, including two postscript figure files. Revised to extend range of Coleman De Luccia theories considered and to include models with a cosmological constant
Published: 1999

28. Beyond the inflationary border

Author: Paul J. Steinhardt and Steven Gratton
Subjects: Inflation (cosmology), Physics, Molecular interactions, Multidisciplinary, Keynesian economics, Computer Science::Programming Languages, Inflationary epoch, Computational biology, Eternal inflation
Abstract: Observational data now offer strong support for inflation — a period of exponentially fast expansion in the early history of the Universe. But is the theory complete?
Published: 2003
Full Text: View/download PDF

29. Planck 2015 results. II. Low Frequency Instrument data processing

Author: E. Martínez-González, F. Couchot, Hannu Kurki-Suonio, M. Piat, T. Riller, P. A. R. Ade, W. A. Holmes, B. Racine, S. Mottet, Peregrine McGehee, J.-F. Sygnet, F. Cuttaia, D. L. Clements, N. Ponthieu, L. Sanselme, J. J. Bock, X. Dupac, A. Curto, Simon Prunet, Jérôme Bobin, A. Chamballu, R. Kneissl, R. Keskitalo, Steven Gratton, K. Ganga, P. Bielewicz, G. Rocha, William T. Reach, O. Doré, J.-L. Puget, D. L. Harrison, Jean-François Cardoso, L. Perotto, Jose M. Diego, Lloyd Knox, E. P. S. Shellard, R. Paladini, O. Herent, W. Hovest, E. Pointecouteau, P. B. Lilje, R. J. Laureijs, J. A. Tauber, R. B. Barreiro, Michele Liguori, J. Borrill, A. Benoit-Lévy, Fernando Atrio-Barandela, K. M. Górski, M. Tristram, J. Delabrouille, F. Piacentini, L. Vibert, M. Giard, F. Noviello, D. Hanson, Aurelien A. Fraisse, R. J. Davis, G. Hurier, A. Gregorio, George Helou, François R. Bouchet, Calvin B. Netterfield, B. P. Crill, Charles R. Lawrence, G. Patanchon, J. F. Macías-Pérez, G. Roudier, Fabio Finelli, D. Pietrobon, Carol Anne Oxborrow, A. Zonca, D. Yvon, Bruno Maffei, F. Paci, Lung-Yih Chiang, Silvia Masi, S. D. M. White, F. Pajot, R. D. Davies, M. Le Jeune, A. de Rosa, H. C. Chiang, Sophie Henrot-Versille, L. P. L. Colombo, Michael P. Hobson, Peter Meinhold, K. Benabed, F. Perrotta, Dmitry Novikov, M. Frailis, Daniele Tavagnacco, Carlo Baccigalupi, F.-X. Désert, Alessandro Melchiorri, Julien Lesgourgues, Mika Juvela, E. Hivon, Xin Chen, J. R. Bond, Dipak Munshi, François Orieux, George Efstathiou, J.-M. Lamarre, Alessandro Gruppuso, Nicola Vittorio, M. Arnaud, J. González-Nuevo, A. Zacchei, T. Poutanen, C. Armitage-Caplan, G. W. Pratt, B. Rusholme, Michael Rowan-Robinson, Andrew H. Jaffe, Fabio Pasian, F. Villa, J.-P. Bernard, Gianluca Morgante, G. Umana, Sabino Matarrese, Marc-Antoine Miville-Deschenes, L. Montier, Locke D. Spencer, Philip Lubin, A. Moneti, Luca Valenziano, S. Mitra, J. Knoche, Allan Hornstrup, Michele Maris, Federico Nati, Z. Hou, Torsten A. Enßlin, M. Ashdown, Anthony Lasenby, H. K. Eriksen, M. Tomasi, D. Paoletti, G. Lagache, S. Osborne, R. V. Sudiwala, E. Keihänen, Jean-Luc Starck, S. R. Hildebrandt, D. J. Marshall, Luca Terenzi, C. Combet, V. Stolyarov, C. J. MacTavish, P. R. Christensen, Marco Bersanelli, B. D. Wandelt, Rafael Rebolo, A. Coulais, T. R. Jaffe, D. Herranz, M. Kunz, P. Natoli, Martin Reinecke, E. Battaner, Carlo Burigana, L. Mendes, Pavel D. Naselsky, F. Boulanger, L. Danese, P. de Bernardis, Stéphane Plaszczynski, Mathieu Remazeilles, I. Ristorcelli, G. de Zotti, Giovanna Giardino, Clive Dickinson, M. Douspis, D. Sutton, J. Aumont, J. Valiviita, C. North, A. Sauvé, Aurélien Benoit, Lawrence A. Wade, S. Ricciardi, B. Van Tent, A. J. Banday, F. Sureau, Nazzareno Mandolesi, J.-M. Delouis, C. Rosset, Jon E. Gudmundsson, L. Pagano, Hans Ulrik Nørgaard-Nielsen, R. Stompor, D. Girard, F. Matthai, Jörg P. Rachen, C. Renault, A.-S. Suur-Uski, D. Santos, M. Bucher, M. Migliaccio, R. Leonardi, Olivier Forni, F. K. Hansen, M. Tucci, Stéphane Colombi, M. Bridges, E. Franceschi, P. Vielva, S. Galeotta, Pierrick Martin, Elena Pierpaoli, Y. Giraud-Héraud, Pasquale Mazzotta, H. Dole, Theodore Kisner, Claude Leroy, I. D. Novikov, G. Prézeau, M. López-Caniego, R.-R. Chary, L. Popa, Daniel J. Mortlock, C. Hernández-Monteagudo, Kevin M. Huffenberger, Jo Dunkley, G. Polenta, M. Linden-Vørnle, Sarah E. Church, J. W. Bowyer, W. C. Jones, A. Mennella, Nabila Aghanim, O. Perdereau, S. Donzelli, Giorgio Savini, A. Catalano, S. Techene, Ade, P. A. R., Aghanim, N., Ashdown, M., Aumont, J., Baccigalupi, C., Ballardini, M., Banday, A. J., Barreiro, R. B., Bartolo, N., Basak, S., Battaglia, PAOLA MARIA, Battaner, E., Benabed, K., Benoît, A., Benoit Lévy, A., Bernard, J. P., Bersanelli, M., Bielewicz, P., Bock, J. J., Bonaldi, A., Bonavera, L., Bond, J. R., Borrill, J., Bouchet, F. R., Bucher, M., Burigana, C., Butler, R. C., Calabrese, E., Cardoso, J. F., Castex, G., Catalano, A., Chamballu, A., Christensen, P. R., Colombi, S., Colombo, L. P. L., Crill, B. P., Curto, A., Cuttaia, F., Danese, L., Davies, R. D., Davis, R. J., De Bernardis, P., De Rosa, A., De Zotti, G., Delabrouille, J., Dickinson, C., Diego, J. M., Dole, H., Donzelli, Simona, Doré, O., Douspis, M., Ducout, A., Dupac, X., Efstathiou, G., Elsner, F., Enßlin, T. A., Eriksen, H. K., Fergusson, J., Finelli, F., Forni, O., Frailis, M., Franceschet, C., Franceschi, E., Frejsel, A., Galeotta, S., Galli, S., Ganga, K., Giard, M., Giraud Héraud, Y., Gjerløw, E., González Nuevo, J., Górski, K. M., Gratton, S., Gregorio, Anna, Gruppuso, A., Hansen, F. K., Hanson, D., Harrison, D. L., Henrot Versillé, S., Herranz, D., Hildebrandt, S. R., Hivon, E., Hobson, M., Holmes, W. A., Hornstrup, A., Hovest, W., Huffenberger, K. M., Hurier, G., Jaffe, A. H., Jaffe, T. R., Juvela, M., Keihänen, E., Keskitalo, R., Kiiveri, K., Kisner, T. S., Knoche, J., Krachmalnicoff, N., Kunz, M., Kurki Suonio, H., Lagache, G., Lähteenmäki, A., Lamarre, J. M., Lasenby, A., Lattanzi, M., Lawrence, C. R., Leahy, J. P., Leonardi, R., Lesgourgues, J., Levrier, F., Liguori, M., Lilje, P. B., Linden Vørnle, M., Lindholm, V., López Caniego, M., Lubin, P. M., Macías Pérez, J. F., Maggio, G., Maino, D., Mandolesi, N., Mangilli, A., Maris, M., Martin, P. G., Martínez González, E., Masi, S., Matarrese, S., Mazzotta, P., Mcgehee, P., Meinhold, P. R., Melchiorri, A., Mendes, L., Mennella, A., Migliaccio, M., Mitra, S., Montier, L., Morgante, G., Morisset, N., Mortlock, D., Moss, A., Munshi, D., Murphy, J. A., Naselsky, P., Nati, F., Natoli, P., Netterfield, C. B., Nørgaard Nielsen, H. U., Novikov, D., Novikov, I., Oppermann, N., Paci, F., Pagano, L., Paoletti, D., Partridge, B., Pasian, F., Patanchon, G., Pearson, T. J., Peel, M., Perdereau, O., Perotto, L., Perrotta, F., Pettorino, V., Piacentini, F., Pierpaoli, E., Pietrobon, D., Pointecouteau, E., Polenta, G., Pratt, G. W., Prézeau, G., Prunet, S., Puget, J. L., Rachen, J. P., Rebolo, R., Reinecke, M., Remazeilles, M., Renzi, A., Rocha, G., Romelli, Erik, Rosset, C., Rossetti, M., Roudier, G., Rubiño Martín, J. A., Rusholme, B., Sandri, M., Santos, D., Savelainen, M., Scott, D., Seiffert, M. D., Shellard, E. P. S., Spencer, L. D., Stolyarov, V., Sutton, D., Suur Uski, A. S., Sygnet, J. F., Tauber, J. A., Tavagnacco, Daniele, Terenzi, L., Toffolatti, L., Tomasi, M., Tristram, M., Tucci, M., Tuovinen, J., Türler, M., Umana, G., Valenziano, L., Valiviita, J., Van Tent, B., Vassallo, T., Vielva, P., Villa, F., Wade, L. A., Wandelt, B. D., Watson, R., Wehus, I. K., Wilkinson, A., Yvon, D., Zacchei, A, Zonca, A., Ade, P, Aghanim, N, Ashdown, M, Aumont, J, Baccigalupi, C, Ballardini, M, Banday, A, Barreiro, R, Bartolo, N, Basak, S, Battaglia, P, Battaner, E, Benabed, K, Benoît, A, Benoit Lévy, A, Bernard, J, Bersanelli, M, Bielewicz, P, Bock, J, Bonaldi, A, Bonavera, L, Bond, J, Borrill, J, Bouchet, F, Bucher, M, Burigana, C, Butler, R, Calabrese, E, Cardoso, J, Castex, G, Catalano, A, Chamballu, A, Christensen, P, Colombi, S, Colombo, L, Crill, B, Curto, A, Cuttaia, F, Danese, L, Davies, R, Davis, R, DE BERNARDIS, P, De Rosa, A, De Zotti, G, Delabrouille, J, Dickinson, C, Diego, J, Dole, H, Donzelli, S, Doré, O, Douspis, M, Ducout, A, Dupac, X, Efstathiou, G, Elsner, F, Enßlin, T, Eriksen, H, Fergusson, J, Finelli, F, Forni, O, Frailis, M, Franceschet, C, Franceschi, E, Frejsel, A, Galeotta, S, Galli, S, Ganga, K, Giard, M, Giraud Héraud, Y, Gjerløw, E, González Nuevo, J, Górski, K, Gratton, S, Gregorio, A, Gruppuso, A, Hansen, F, Hanson, D, Harrison, D, Henrot Versillé, S, Herranz, D, Hildebrandt, S, Hivon, E, Hobson, M, Holmes, W, Hornstrup, A, Hovest, W, Huffenberger, K, Hurier, G, Jaffe, A, Jaffe, T, Juvela, M, Keihänen, E, Keskitalo, R, Kiiveri, K, Kisner, T, Knoche, J, Krachmalnicoff, N, Kunz, M, Kurki Suonio, H, Lagache, G, Lähteenmäki, A, Lamarre, J, Lasenby, A, Lattanzi, M, Lawrence, C, Leahy, J, Leonardi, R, Lesgourgues, J, Levrier, F, Liguori, M, Lilje, P, Linden Vørnle, M, Lindholm, V, López Caniego, M, Lubin, P, Macías Pérez, J, Maggio, G, Maino, D, Mandolesi, N, Mangilli, A, Maris, M, Martin, P, Martínez González, E, Masi, S, Matarrese, S, Mazzotta, P, Mcgehee, P, Meinhold, P, Melchiorri, A, Mendes, L, Mennella, A, Migliaccio, M, Mitra, S, Montier, L, Morgante, G, Morisset, N, Mortlock, D, Moss, A, Munshi, D, Murphy, J, Naselsky, P, Nati, F, Natoli, P, Netterfield, C, Nørgaard Nielsen, H, Novikov, D, Novikov, I, Oppermann, N, Paci, F, Pagano, L, Paoletti, D, Partridge, B, Pasian, F, Patanchon, G, Pearson, T, Peel, M, Perdereau, O, Perotto, L, Perrotta, F, Pettorino, V, Piacentini, F, Pierpaoli, E, Pietrobon, D, Pointecouteau, E, Polenta, G, Pratt, G, Prézeau, G, Prunet, S, Puget, J, Rachen, J, Rebolo, R, Reinecke, M, Remazeilles, M, Renzi, A, Rocha, G, Romelli, E, Rosset, C, Rossetti, M, Roudier, G, Rubiño Martín, J, Rusholme, B, Sandri, M, Santos, D, Savelainen, M, Scott, D, Seiffert, M, Shellard, E, Spencer, L, Stolyarov, V, Sutton, D, Suur Uski, A, Sygnet, J, Tauber, J, Tavagnacco, D, Terenzi, L, Toffolatti, L, Tomasi, M, Tristram, M, Tucci, M, Tuovinen, J, Türler, M, Umana, G, Valenziano, L, Valiviita, J, Van Tent, B, Vassallo, T, Vielva, P, Villa, F, Wade, L, Wandelt, B, Watson, R, Wehus, I, Wilkinson, A, Yvon, D, Zonca, A, Hélium : du fondamental aux applications (HELFA), Institut Néel (NEEL), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019])-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019]), Laboratoire de l'Accélérateur Linéaire (LAL), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019]), Planck, Hélium : du fondamental aux applications (NEEL - HELFA), AstroParticule et Cosmologie (APC (UMR_7164)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique Théorique d'Orsay [Orsay] (LPT), and Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS)
Subjects: Space vehicles: instruments – Methods:data analysis – cosmic microwave background, [PHYS.ASTR.IM]Physics [physics]/Astrophysics [astro-ph]/Instrumentation and Methods for Astrophysic [astro-ph.IM], Cosmology and Nongalactic Astrophysics (astro-ph.CO), [SDU.ASTR.CO]Sciences of the Universe [physics]/Astrophysics [astro-ph]/Cosmology and Extra-Galactic Astrophysics [astro-ph.CO], Astronomy, Cosmic microwave background, FOS: Physical sciences, Space vehicles: instrument, Cosmic background radiation, 01 natural sciences, NO, instruments [Space vehicles], Optics, Settore FIS/05 - Astronomia e Astrofisica, Methods: data analysis, 0103 physical sciences, instrument [Space vehicles], Calibration, Space vehicles: instruments, Astronomy and Astrophysics, Space and Planetary Science, Angular resolution, data analysis [Methods], 010303 astronomy & astrophysics, Instrumentation and Methods for Astrophysics (astro-ph.IM), QC, QB, Physics, 010308 nuclear & particles physics, business.industry, Instrument Data, Detector, Spectral density, Ranging, Astronomy and Astrophysic, data analysi [Methods], business, Astrophysics - Instrumentation and Methods for Astrophysics, Noise (radio), Methods: data analysi, Astrophysics - Cosmology and Nongalactic Astrophysics
Abstract: CSIC, Consejo Superior de Investigaciones Científicas; ERC, European Research Council; MINECO, Ministerio de Economía y Competitividad; MPG, Max-Planck-Gesellschaft; NASA, National Aeronautics and Space Administration; etc., Ade, P.A.R., Aghanim, N., Ashdown, M., Aumont, J., Baccigalupi, C., Ballardini, M., Banday, A.J., Barreiro, R.B., Bartolo, N., Basak, S., Battaglia, P., Battaner, E., Benabed, K., Benoît, A., Benoit-Lévy, A., Bernard, J.-P., Bersanelli, M., Bielewicz, P., Bock, J.J., Bonaldi, A., Bonavera, L., Bond, J.R., Borrill, J., Bouchet, F.R., Bucher, M., Burigana, C., Butler, R.C., Calabrese, E., Cardoso, J.-F., Castex, G., Catalano, A., Chamballu, A., Christensen, P.R., Colombi, S., Colombo, L.P.L., Crill, B.P., Curto, A., Cuttaia, F., Danese, L., Davies, R.D., Davis, R.J., De Bernardis, P., De Rosa, A., De Zotti, G., Delabrouille, J., Dickinson, C., Diego, J.M., Dole, H., Donzelli, S., Doré, O., Douspis, M., Ducout, A., Dupac, X., Efstathiou, G., Elsner, F., Enßlin, T.A., Eriksen, H.K., Fergusson, J., Finelli, F., Forni, O., Frailis, M., Franceschet, C., Franceschi, E., Frejsel, A., Galeotta, S., Galli, S., Ganga, K., Giard, M., Giraud-Héraud, Y., Gjerløw, E., González-Nuevo, J., Górski, K.M., Gratton, S., Gregorio, A., Gruppuso, A., Hansen, F.K., Hanson, D., Harrison, D.L., Henrot-Versillé, S., Herranz, D., Hildebrandt, S.R., Hivon, E., Hobson, M., Holmes, W.A., Hornstrup, A., Hovest, W., Huffenberger, K.M., Hurier, G., Jaffe, A.H., Jaffe, T.R., Juvela, M., Keihänen, E., Keskitalo, R., Kiiveri, K., Kisner, T.S., Knoche, J., Krachmalnicoff, N., Kunz, M., Kurki-Suonio, H., Lagache, G., Lähteenmäki, A., Lamarre, J.-M., Lasenby, A., Lattanzi, M., Lawrence, C.R., Leahy, J.P., Leonardi, R., Lesgourgues, J., Levrier, F., Liguori, M., Lilje, P.B., Linden-Vørnle, M., Lindholm, V., López-Caniego, M., Lubin, P.M., Macías-Pérez, J.F., Maggio, G., Maino, D., Mandolesi, N., Mangilli, A., Maris, M., Martin, P.G., Martínez-González, E., Masi, S., Matarrese, S., Mazzotta, P., McGehee, P., Meinhold, P.R., Melchiorri, A., Mendes, L., Mennella, A., Migliaccio, M., Mitra, S., Montier, L., Morgante, G., Morisset, N., Mortlock, D., Moss, A., Munshi, D., Murphy, J.A., Naselsky, P., Nati, F., Natoli, P., Netterfield, C.B., Nørgaard-Nielsen, H.U., Novikov, D., Novikov, I., Oppermann, N., Paci, F., Pagano, L., Paoletti, D., Partridge, B., Pasian, F., Patanchon, G., Pearson, T.J., Peel, M., Perdereau, O., Perotto, L., Perrotta, F., Pettorino, V., Piacentini, F., Pierpaoli, E., Pietrobon, D., Pointecouteau, E., Polenta, G., Pratt, G.W., Prézeau, G., Prunet, S., Puget, J.-L., Rachen, J.P., Rebolo, R., Reinecke, M., Remazeilles, M., Renzi, A., Rocha, G., Romelli, E., Rosset, C., Rossetti, M., Roudier, G., Rubiño-Martín, J.A., Rusholme, B., Sandri, M., Santos, D., Savelainen, M., Scott, D., Seiffert, M.D., Shellard, E.P.S., Spencer, L.D., Stolyarov, V., Sutton, D., Suur-Uski, A.-S., Sygnet, J.-F., Tauber, J.A., Tavagnacco, D., Terenzi, L., Toffolatti, L., Tomasi, M., Tristram, M., Tucci, M., Tuovinen, J., Türler, M., Umana, G., Valenziano, L., Valiviita, J., Van Tent, B., Vassallo, T., Vielva, P., Villa, F., Wade, L.A., Wandelt, B.D., Watson, R., Wehus, I.K., Wilkinson, A., Yvon, D., Zacchei, A., Zonca, A.
Full Text: View/download PDF

Catalog

Books, media, physical & digital resources

See catalog results

Searchworks

Select search scope, currently: Articles

Catalog

books, media & more in Jio Institute collections

Articles

journal articles & other e-resources

Refine your results

29 results on '"Steven Gratton"'

1. A Detailed Description of the CAMSPEC Likelihood Pipeline and a Reanalysis of the Planck High Frequency Maps

2. B-mode constraints from Planck low-multipole polarization data

3. Quantum Reasoning using Lie Algebra for Everyday Life (and AI perhaps...).

4. Graphics Card Computing for Cosmology: Cholesky Factorization.

5. Inference of the optical depth to reionization from low multipole temperature and polarisation Planck data

6. Planck 2018 results: VI. Cosmological parameters (Corrigendum)

7. Planck 2018 results

8. The evidence for a spatially flat Universe

9. Understanding parameter differences between analyses employing nested data subsets

10. Model independentH(z) reconstruction using the cosmic inverse distance ladder

11. Planck 2018 results. VIII. Gravitational lensing

12. Planck 2013 results. XX. Cosmology from Sunyaev-Zeldovich cluster counts

13. Path Integral for Stochastic Inflation: Non-Perturbative Volume Weighting, Complex Histories, Initial Conditions and the End of Inflation

14. B-mode Detection with an Extended Planck Mission

15. Impact of Galactic polarized emission on B-mode detection at low multipoles

16. Prospects for Constraining Neutrino Mass Using Planck and Lyman-Alpha Forest Data

17. Measures on transitions for cosmology from eternal inflation

18. Hurdles for Recent Measures in Eternal Inflation

19. Cosmic Perturbations Through the Cyclic Ages

20. Langevin analysis of eternal inflation

21. Conditions for generating scale-invariant density perturbations

22. Inflation without a beginning: a null boundary proposal

23. Closed universes from cosmological instantons

24. Steady-State Eternal Inflation

25. Homogeneous Modes of Cosmological Instantons

26. Cosmological perturbations from the no boundary Euclidean path integral

27. An Observational Test of Quantum Cosmology

28. Beyond the inflationary border

29. Planck 2015 results. II. Low Frequency Instrument data processing

Catalog

Searchworks

Select search scope, currently: Articles Catalog books, media & more in Jio Institute collections Articles journal articles & other e-resources

Search

Search Constraints

Refine your results

Search Limiters

Topic

Publication Year Range

Language

Publication Type

Journal

Database

Publisher

29 results on '"Steven Gratton"'

Search Results

Catalog

Select search scope, currently: Articles

Catalog

books, media & more in Jio Institute collections

Articles

journal articles & other e-resources