6 results on '"Baker, Tessa"'
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2. High angular resolution gravitational wave astronomy.
- Author
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Baker, John, Baker, Tessa, Carbone, Carmelita, Congedo, Giuseppe, Contaldi, Carlo, Dvorkin, Irina, Gair, Jonathan, Haiman, Zoltan, Mota, David F., Renzini, Arianna, Buis, Ernst-Jan, Cusin, Giulia, Ezquiaga, Jose Maria, Mueller, Guido, Pieroni, Mauro, Quenby, John, Ricciardone, Angelo, Saltas, Ippocratis D., Shao, Lijing, and Tamanini, Nicola
- Subjects
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GRAVITATIONAL wave astronomy , *GRAVITATIONAL wave detectors , *GRAVITATIONAL waves , *ELECTROMAGNETIC spectrum , *BLACK holes , *STANDARD model (Nuclear physics) , *BINARY black holes - Abstract
Since the very beginning of astronomy the location of objects on the sky has been a fundamental observational quantity that has been taken for granted. While precise two dimensional positional information is easy to obtain for observations in the electromagnetic spectrum, the positional accuracy of current and near future gravitational wave detectors is limited to between tens and hundreds of square degrees, which makes it extremely challenging to identify the host galaxies of gravitational wave events or to detect any electromagnetic counterparts. Gravitational wave observations provide information on source properties that is complementary to the information in any associated electromagnetic emission. Observing systems with multiple messengers thus has scientific potential much greater than the sum of its parts. A gravitational wave detector with higher angular resolution would significantly increase the prospects for finding the hosts of gravitational wave sources and triggering a multi-messenger follow-up campaign. An observatory with arcminute precision or better could be realised within the Voyage 2050 programme by creating a large baseline interferometer array in space and would have transformative scientific potential. Precise positional information of standard sirens would enable precision measurements of cosmological parameters and offer new insights on structure formation; a high angular resolution gravitational wave observatory would allow the detection of a stochastic background and resolution of the anisotropies within it; it would also allow the study of accretion processes around black holes; and it would have tremendous potential for tests of modified gravity and the discovery of physics beyond the Standard Model. [ABSTRACT FROM AUTHOR]
- Published
- 2021
- Full Text
- View/download PDF
3. Cosmology with the Laser Interferometer Space Antenna.
- Author
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Auclair, Pierre, Bacon, David, Baker, Tessa, Barreiro, Tiago, Bartolo, Nicola, Belgacem, Enis, Bellomo, Nicola, Ben-Dayan, Ido, Bertacca, Daniele, Besancon, Marc, Blanco-Pillado, Jose J., Blas, Diego, Boileau, Guillaume, Calcagni, Gianluca, Caldwell, Robert, Caprini, Chiara, Carbone, Carmelita, Chang, Chia-Feng, Chen, Hsin-Yu, and Christensen, Nelson
- Subjects
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LASER interferometers , *ANTENNAS (Electronics) , *PHYSICAL cosmology , *PARTICLE physics , *PLANCK scale , *GRAVITATIONAL waves - Abstract
The Laser Interferometer Space Antenna (LISA) has two scientific objectives of cosmological focus: to probe the expansion rate of the universe, and to understand stochastic gravitational-wave backgrounds and their implications for early universe and particle physics, from the MeV to the Planck scale. However, the range of potential cosmological applications of gravitational-wave observations extends well beyond these two objectives. This publication presents a summary of the state of the art in LISA cosmology, theory and methods, and identifies new opportunities to use gravitational-wave observations by LISA to probe the universe. [ABSTRACT FROM AUTHOR]
- Published
- 2023
- Full Text
- View/download PDF
4. New gravitational scales in cosmological surveys.
- Author
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Baker, Tessa, Ferreira, Pedro G., Danielle Leonard, C., and Motta, Mariele
- Subjects
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GRAVITATION , *GRAVITATIONAL waves , *GENERAL relativity (Physics) , *PARTICLES (Nuclear physics) , *PARTICLE physics - Abstract
In the quasistatic regime, generic modifications to gravity can give rise to novel scale dependence of the gravitational field equations. Crucially, the detectability of the new scale-dependent terms hinges upon the existence of an effective mass scale or length scale at which corrections to general relativity become relevant. Starting from only a few basic principles, we derive the general form of this scale dependence. Our method recovers results previously known in the specific case of Homdeski gravity, but also shows that they are valid more generally, beyond the regime of scalar field theories. We forecast the constraints that upcoming experiments will place on the existence of a new fundamental mass scale or length scale in cosmology. [ABSTRACT FROM AUTHOR]
- Published
- 2014
- Full Text
- View/download PDF
5. A fast route to modified gravitational growth.
- Author
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Baker, Tessa, Ferreira, Pedro, and Skordis, Constantinos
- Subjects
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GRAVITATIONAL waves , *ASTRONOMICAL observations , *METAPHYSICAL cosmology , *GENERAL relativity (Physics) , *GRAVITY - Abstract
The growth rate of the large-scale structure of the Universe has been advocated as the observable par excellence for testing gravity on cosmological scales. By considering linear-order deviations from general relativity, we show that corrections to the growth rate, f, can be expressed as an integral over a "source" term, weighted by a theory-independent "response kernel." This leads to an efficient and accurate "plug-and-play" expression for generating growth rates in alternative gravity theories, bypassing lengthy theory-specific computations. We use this approach to explicitly show that f is sensitive to a degenerate combination of modified expansion and modified clustering effects. Hence the growth rate, when used in isolation, is not a straightforward diagnostic of modified gravity. [ABSTRACT FROM AUTHOR]
- Published
- 2014
- Full Text
- View/download PDF
6. Multimessenger time delays from lensed gravitational waves.
- Author
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Baker, Tessa and Trodden, Mark
- Subjects
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GRAVITATIONAL waves , *AXIONS - Abstract
We investigate the potential of high-energy astrophysical events, from which both massless and massive signals are detected, to probe fundamental physics. In particular, we consider how strong gravitational lensing can induce time delays in multimessenger signals from the same source. Obvious messenger examples are massless photons and gravitational waves, and massive neutrinos, although more exotic applications can also be imagined, such as to massive gravitons or axions. The different propagation times of the massive and massless particles can, in principle, place bounds on the total neutrino mass and probe cosmological parameters. Whilst measuring such an effect may pose a significant experimental challenge, we believe that the "massive time delay" represents an unexplored fundamental physics phenomenon. [ABSTRACT FROM AUTHOR]
- Published
- 2017
- Full Text
- View/download PDF
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