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258 results on '"Raffai, Peter"'

1. Constraints on coasting cosmological models from gravitational-wave standard sirens

Author: Raffai, Peter, Pálfi, Mária, Dálya, Gergely, and Gray, Rachel
Subjects: Astrophysics - Cosmology and Nongalactic Astrophysics, 85A40
Abstract: We present the first test of coasting cosmological models with gravitational-wave standard sirens observed in the first three observing runs of the LIGO-Virgo-KAGRA detector network. We apply the statistical galaxy catalog method adapted to coasting cosmologies and infer constraints on the $H_0$ Hubble constant for the three fixed values of the curvature parameter $k=\left\{ -1,0,+1 \right\}$ in $H_0^2 c^{-2}$ units. The maximum posteriors and $68.3\%$ highest density intervals we obtained from a combined analysis of $46$ dark siren detections and a single bright siren detection are $H_0=\left\{68.1^{+8.5}_{-5.6},67.5^{+8.3}_{-5.2},67.1^{+6.6}_{-5.8} \right\}~\mathrm{km\ s^{-1}\ Mpc^{-1}}$, respectively. All our constraints on $H_0$ are consistent within one sigma with the $H_0$ measured with the differential age method, which provides a constraint on $H_0$ in coasting cosmologies independently from $k$. Our results constrain all cosmological models with $a(t)\propto t$ linear expansion in the luminosity distance and redshift range of the $47$ LIGO-Virgo detections, i.e. $d_\mathrm{L}\lesssim 5~\mathrm{Gpc}$ and $z\lesssim 0.8$, which practically include all (both strictly linear and quasi-linear) models in the coasting model family. As we have found, the coasting models and the $\Lambda$CDM model fit equally well to the applied set of gravitational-wave detections., Comment: 7 pages, 3 figures, 1 table
Published: 2023

2. The Hitchhiker's guide to the galaxy catalog approach for gravitational wave cosmology

Author: Gair, Jonathan R., Ghosh, Archisman, Gray, Rachel, Holz, Daniel E., Mastrogiovanni, Simone, Mukherjee, Suvodip, Palmese, Antonella, Tamanini, Nicola, Baker, Tessa, Beirnaert, Freija, Bilicki, Maciej, Chen, Hsin-Yu, Dálya, Gergely, Ezquiaga, Jose Maria, Farr, Will M., Fishbach, Maya, Garcia-Bellido, Juan, Ghosh, Tathagata, Huang, Hsiang-Yu, Karathanasis, Christos, Leyde, Konstantin, Hernandez, Ignacio Magaña, Noller, Johannes, Pierra, Gregoire, Raffai, Peter, Romano, Antonio Enea, Seglar-Arroyo, Monica, Steer, Danièle A., Turski, Cezary, Vaccaro, Maria Paola, and Vallejo-Peña, Sergio Andrés
Subjects: General Relativity and Quantum Cosmology, Astrophysics - Cosmology and Nongalactic Astrophysics
Abstract: We outline the ``dark siren'' galaxy catalog method for cosmological inference using gravitational wave (GW) standard sirens, clarifying some common misconceptions in the implementation of this method. When a confident transient electromagnetic counterpart to a GW event is unavailable, the identification of a unique host galaxy is in general challenging. Instead, as originally proposed by Schutz (1986), one can consult a galaxy catalog and implement a dark siren statistical approach incorporating all potential host galaxies within the localization volume. Trott & Hunterer 2021 recently claimed that this approach results in a biased estimate of the Hubble constant, $H_0$, when implemented on mock data, even if optimistic assumptions are made. We demonstrate explicitly that, as previously shown by multiple independent groups, the dark siren statistical method leads to an unbiased posterior when the method is applied to the data correctly. We highlight common sources of error possible to make in the generation of mock data and implementation of the statistical framework, including the mismodeling of selection effects and inconsistent implementations of the Bayesian framework, which can lead to a spurious bias., Comment: 19 pages, 11 figures. Submitted to ApJ
Published: 2022
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3. Prospects for reconstructing the gravitational-wave signals from core-collapse supernovae with Advanced LIGO-Virgo and the BayesWave algorithm

Author: Raza, Nayyer, McIver, Jess, Dálya, Gergely, and Raffai, Peter
Subjects: Astrophysics - High Energy Astrophysical Phenomena, General Relativity and Quantum Cosmology
Abstract: Our current understanding of the core-collapse supernova explosion mechanism is incomplete, with multiple viable models for how the initial shock wave might be energized enough to lead to a successful explosion. Detection of a gravitational-wave signal emitted in the initial few seconds after stellar core-collapse would provide unique and crucial insight into this process. With the Advanced LIGO and Advanced Virgo detectors expected to approach their design sensitivities soon, we could potentially detect this signal from a supernova within our galaxy. In anticipation of such a scenario, we study how well the BayesWave algorithm can recover the gravitational-wave signal from core-collapse supernova models in simulated advanced detector noise, and optimize its ability to accurately reconstruct the signal waveforms. We find that BayesWave can confidently reconstruct the signal from a range of supernova explosion models in Advanced LIGO-Virgo for network signal-to-noise ratios $\gtrsim 30$, reaching maximum reconstruction accuracies of $\sim 90\%$ at SNR $\sim 100$. For low SNR signals that are not confidently recovered, our optimization efforts result in gains in reconstruction accuracy of up to $20-40\%$, with typical gains of $\sim 10\%$., Comment: 18 pages, 8 figures, submitted to Phys. Rev. D
Published: 2022
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4. Statistical search for angular non-stationarities of long gamma-ray burst jets using Swift data

Author: Budai, Andor, Raffai, Peter, Borgulya, Balint, Dawes, Brian Albert, and Szeifert, Gabor
Subjects: Astrophysics - High Energy Astrophysical Phenomena
Abstract: In Budai et al. (2020) we argued that angular non-stationarities of gamma-ray burst (GRB) jets can result in a statistical connection between the angle values deduced from jet break times and the variabilities of prompt light curves. The connection should be an anti-correlation if luminosity densities of jets follow a power-law or a uniform profile, and a correlation if they have a Gaussian profile. In this follow-up paper, we search for the connection by measuring Spearman's rank correlation coefficient in a sample of 19 long GRBs observed by the Swift satellite. Using 16 of the GRBs with well-defined angle measurements, we find $\rho = -0.20_{-0.09}^{+0.09}$ and $p = 0.46_{-0.19}^{+0.23}$. Adding three more GRBs to the sample, each with a pair of equally possible angle values, can strengthen the anti-correlation to $\rho=-0.31_{-0.08}^{+0.07}$ and $p=0.19_{-0.09}^{+0.14}$. We show that these results are incompatible with non-stationary jets having Gaussian profiles, and that $\gtrsim\!100$ GRBs with observed afterglows would be needed to confirm the potential existence of the angle-variability anti-correlation with $3\sigma$ significance. If the connection is real, GRB jet angles would be constrainable from prompt gamma light curves, without the need of afterglow observations., Comment: 4 pages, 1 figure, published in MNRAS, The codes we used to produce the results of Budai et al. (2020) and this paper can be accessed at https://github.com/BMetod
Published: 2021
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5. Bayesian Reconstruction of Gravitational-wave Signals from Binary Black Holes with Nonzero Eccentricities

Author: Dálya, Gergely, Raffai, Peter, and Bécsy, Bence
Subjects: Astrophysics - High Energy Astrophysical Phenomena
Abstract: We present a comprehensive study on how well gravitational-wave signals of binary black holes with nonzero eccentricities can be recovered with state of the art model-independent waveform reconstruction and parameter estimation techniques. For this we use BayesWave, a Bayesian algorithm used by the LIGO-Virgo Collaboration for unmodeled reconstructions of signal waveforms and parameters. We used two different waveform models to produce simulated signals of binary black holes with eccentric orbits and embed them in samples of simulated noise of design-sensitivity Advanced LIGO detectors. We studied the network overlaps and point estimates of central moments of signal waveforms recovered by BayesWave as a function of $e$, the eccentricity of the binary at 8 Hz orbital frequency. BayesWave recovers signals of near-circular ($e\lesssim0.2$) and highly eccentric ($e\gtrsim0.7$) binaries with network overlaps similar to that of circular ($e=0$) ones, however it produces lower network overlaps for binaries with $e\in[0.2,0.7]$. Estimation errors on central frequencies and bandwidths (measured relative to bandwidths) are nearly independent from $e$, while estimation errors on central times and durations (measured relative to durations) increase and decrease with $e$ above $e\gtrsim0.5$, respectively. We also tested how BayesWave performs when reconstructions are carried out using generalized wavelets with linear frequency evolution (chirplets) instead of sine-Gaussian wavelets. We have found that network overlaps improve by $\sim 10-20$ percent when chirplets are used, and the improvement is the highest at low ($e<0.5$) eccentricities. There is however no significant change in the estimation errors of central moments when the chirplet base is used., Comment: 16 pages, 9 figures, accepted for publication in CQG
Published: 2020
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6. Interpreting gravitational-wave burst detections: constraining source properties without astrophysical models

Author: Bécsy, Bence, Raffai, Peter, Gill, Kiranjyot, Littenberg, Tyson B, Millhouse, Margaret, and Szczepańczyk, Marek J
Subjects: General Relativity and Quantum Cosmology, Astrophysics - High Energy Astrophysical Phenomena
Abstract: We show that for detections of gravitational-wave transients, constraints can be given on physical parameters of the source without using any specific astrophysical models. Relying only on fundamental principles of general relativity, we can set upper limits on the size, mass, and distance of the source solely from characteristics of the observed waveform. If the distance of the source is known from independent (e.g. electromagnetic) observations, we can also set lower limits on the mass and size. As a demonstration, we tested these constraints on binary black hole signals observed by the LIGO and Virgo detectors during their first and second observing runs, as well as on simulated binary black hole and core-collapse supernova signals reconstructed from simulated detector data. We have found that our constraints are valid for all analyzed source types, but their efficiency (namely, how far they are from the true parameter values) strongly depends on the source type, ranging from being in the same order of magnitude to a several orders of magnitude difference. In cases when a gravitational-wave signal is reconstructed without waveform templates and no astrophysical model on the source is available, these constraints provide the only quantitative characterization of the source that can guide the astrophysical modeling process., Comment: 19 pages, 4 figures
Published: 2020
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7. A statistical method to detect non-stationarities of gamma-ray burst jets

Author: Budai, Andor, Raffai, Peter, Borgulya, Balint, Dawes, Brian Albert, Szeifert, Gabor, and Varga, Vince
Subjects: Astrophysics - High Energy Astrophysical Phenomena
Abstract: We propose a method to detect possible non-stationarities of gamma-ray burst jets. Assuming that the dominant source of variability in the prompt gamma light curve is the non-stationarity of the jet, we show that there should be a connection between the variability measure and the characteristic angle of the jet derived from the jet break time of the afterglow. We carried out Monte Carlo simulations of long gamma-ray burst observations assuming three radial luminosity density profiles for jets and randomizing all burst parameters, and created samples of gamma light curves by simulating jets undergoing Brownian motions with linear restoring forces. We were able to demonstrate that the connection between the variability and the characteristic angle is an anti-correlation in case of uniform and power-law jet profiles, and a correlation in case of a Gaussian profile. We have found that as low as $50$ $(144)$ gamma-ray burst observations with jet angle measurements can be sufficient for a $3\sigma\ (5\sigma) $ detection of the connection. The number of observations required for the detection depends on the underlying jet beam profile, ranging from 50 (144) to 237 (659) for the four specific profile models we tested., Comment: 9 pages, 3 figures, published in MNRAS
Published: 2019
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8. Eccentricity distributions of eccentric binary black holes in galactic nuclei

Author: Takátsy, János, Bécsy, Bence, and Raffai, Peter
Subjects: Astrophysics - High Energy Astrophysical Phenomena
Abstract: Galactic nuclei are expected to be one of the main sites for formations of eccentric binary black holes (EBBHs), with an estimated detection rate of $\mathcal{O}(1-100$ yr$^{-1})$ with Advanced LIGO (aLIGO) detectors operating at design sensitivity. The two main formation channels of these binaries are gravitational capture and the secular Kozai-Lidov mechanism, with expectedly commensurable formation rates. We used Monte Carlo simulations to construct the eccentricity distributions of EBBHs formed through these channels in galactic nuclei, at the time their gravitational-wave signals enter the aLIGO band at $10$ Hz. We have found that the proportion of binary black holes entering the aLIGO band with eccentricities larger than $0.1$ is $\sim 10$ percent for the secular Kozai-Lidov mechanism, and $\sim 75$ percent for gravitational capture. We show that if future EBBH detection rates with aLIGO will be dominated by EBBHs formed in galactic nuclei, then the proportions of EBBHs formed through the two main channels can be constrained to a $\Delta \mathcal{F}= 0.2$ wide one-sigma confidence interval with a few tens of observations, even if parameter estimation errors are taken into account at realistic levels., Comment: 13 pages, 6 figures, typos corrected
Published: 2018
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9. GLADE: A Galaxy Catalogue for Multi-Messenger Searches in the Advanced Gravitational-Wave Detector Era

Author: Dálya, Gergely, Galgóczi, Gábor, Dobos, László, Frei, Zsolt, Heng, Ik Siong, Macas, Ronaldas, Messenger, Christopher, Raffai, Péter, and de Souza, Rafael S.
Subjects: Astrophysics - High Energy Astrophysical Phenomena
Abstract: We introduce a value-added full-sky catalogue of galaxies, named as Galaxy List for the Advanced Detector Era, or GLADE. The purpose of this catalogue is to (i) help identifications of host candidates for gravitational-wave events, (ii) support target selections for electromagnetic follow-up observations of gravitational-wave candidates, (iii) provide input data on the matter distribution of the local universe for astrophysical or cosmological simulations, and (iv) help identifications of host candidates for poorly localised electromagnetic transients, such as gamma-ray bursts observed with the InterPlanetary Network. Both being potential hosts of astrophysical sources of gravitational waves, GLADE includes inactive and active galaxies as well. GLADE was constructed by cross-matching and combining data from five separate (but not independent) astronomical catalogues: GWGC, 2MPZ, 2MASS XSC, HyperLEDA and SDSS-DR12Q. GLADE is complete up to $d_L = 37^{+3}_{-4}$ Mpc in terms of the cumulative B-band luminosity of galaxies within luminosity distance $d_L$, and contains all of the brightest galaxies giving half of the total B-band luminosity up to $d_L = 91$ Mpc. As B-band luminosity is expected to be a tracer of binary neutron star mergers (currently the prime targets of joint GW+EM detections), our completeness measures can be used as estimations of completeness for containing all binary neutron star merger hosts in the local universe., Comment: 10 pages, 4 figures, published in MNRAS
Published: 2018
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10. Eccentric Black Hole Gravitational-Wave Capture Sources in Galactic Nuclei: Distribution of Binary Parameters

Author: Gondán, László, Kocsis, Bence, Raffai, Péter, and Frei, Zsolt
Subjects: Astrophysics - High Energy Astrophysical Phenomena, General Relativity and Quantum Cosmology
Abstract: Mergers of binary black holes on eccentric orbits are among the targets for second-generation ground-based gravitational-wave detectors. These sources may commonly form in galactic nuclei due to gravitational-wave emission during close flyby events of single objects. We determine the distributions of initial orbital parameters for a population of these gravitational-wave sources. Our results show that the initial dimensionless pericenter distance systematically decreases with the binary component masses and the mass of the central supermassive black hole, and its distribution depends sensitively on the highest possible black hole mass in the nuclear star cluster. For a multi-mass black hole population with masses between 5 Msun and 80 Msun, we find that between 43-69% (68-94%) of 30 Msun - 30 Msun (10 Msun - 10 Msun) sources have an eccentricity greater than 0.1 when the gravitational-wave signal reaches 10 Hz, but less than 10% of the sources with binary component masses less than 30 Msun remain eccentric at this level near the last stable orbit (LSO). The eccentricity at LSO is typically between 0.005-0.05 for the lower-mass BHs, and 0.1 - 0.2 for the highest-mass BHs. Thus, due to the limited low-frequency sensitivity, the six currently known quasi-circular LIGO/Virgo sources could still be compatible with this originally highly eccentric source population. However, at the design sensitivity of these instruments, the measurement of the eccentricity and mass distribution of merger events may be a useful diagnostic to identify the fraction of GW sources formed in this channel., Comment: 31 pages, 14 figures, version published in ApJ
Published: 2017
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11. Accuracy of Estimating Highly Eccentric Binary Black Hole Parameters with Gravitational-Wave Detections

Author: Gondán, László, Kocsis, Bence, Raffai, Péter, and Frei, Zsolt
Subjects: Astrophysics - High Energy Astrophysical Phenomena, General Relativity and Quantum Cosmology
Abstract: Mergers of stellar-mass black holes on highly eccentric orbits are among the targets for ground-based gravitational-wave detectors, including LIGO, VIRGO, and KAGRA. These sources may commonly form through gravitational-wave emission in high velocity dispersion systems or through the secular Kozai-Lidov mechanism in triple systems. Gravitational waves carry information about the binaries' orbital parameters and source location. Using the Fisher matrix technique, we determine the measurement accuracy with which the LIGO-VIRGO-KAGRA network could measure the source parameters of eccentric binaries using a matched filtering search of the repeated burst and eccentric inspiral phases of the waveform. We account for general relativistic precession and the evolution of the orbital eccentricity and frequency during the inspiral. We find that the signal-to-noise ratio and the parameter measurement accuracy may be significantly higher for eccentric sources than for circular sources. This increase is sensitive to the initial pericenter distance, the initial eccentricity, and component masses. For instance, compared to a 30 Msun-30 Msun non-spinning circular binary, the chirp mass and sky localization accuracy can improve for an initially highly eccentric binary by a factor of ~129 (38) and ~2 (11) assuming an initial pericenter distance of 20 Mtot (10 Mtot)., Comment: 25 pages, 9 figures, version accepted for publication in ApJ
Published: 2017
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12. Target-based Optimization of Advanced Gravitational-Wave Detector Network Operations

Author: Szölgyén, Ákos, Dálya, Gergely, Gondán, László, and Raffai, Péter
Subjects: Astrophysics - Instrumentation and Methods for Astrophysics
Abstract: We introduce two novel time-dependent figures of merit for both online and offline optimizations of advanced gravitational-wave (GW) detector network operations with respect to (i) detecting continuous signals from known source locations and (ii) detecting GWs of neutron star binary coalescences from known local galaxies, which thereby have the highest potential for electromagnetic counterpart detection. For each of these scientific goals, we characterize an $N$-detector network, and all its $(N-1)$-detector subnetworks, to identify subnetworks and individual detectors (key contributors) that contribute the most to achieving the scientific goal. Our results show that aLIGO-Hanford is expected to be the key contributor in 2017 to the goal of detecting GWs from the Crab pulsar within the network of LIGO and Virgo detectors. For the same time period and for the same network, both LIGO detectors are key contributors to the goal of detecting GWs from the Vela pulsar, as well as to detecting signals from 10 high interest pulsars. Key contributors to detecting continuous GWs from the Galactic Center can only be identified for finite time intervals within each sidereal day with either the 3-detector network of the LIGO and Virgo detectors in 2017, or the 4-detector network of the LIGO, Virgo, and KAGRA detectors in 2019-2020. Characterization of the LIGO-Virgo detectors with respect to goal (ii) identified the two LIGO detectors as key contributors. Additionally, for all analyses, we identify time periods within a day when lock losses or scheduled service operations could result with the least amount of signal-to-noise or transient detection probability loss for a detector network., Comment: 16 pages, 5 figures
Published: 2017
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13. Parameter estimation for gravitational-wave bursts with the BayesWave pipeline

Author: Bécsy, Bence, Raffai, Peter, Cornish, Neil J., Essick, Reed, Kanner, Jonah, Katsavounidis, Erik, Littenberg, Tyson B., Millhouse, Margaret, and Vitale, Salvatore
Subjects: Astrophysics - High Energy Astrophysical Phenomena, Astrophysics - Instrumentation and Methods for Astrophysics
Abstract: We provide a comprehensive multi-aspect study on the performance of a pipeline used by the LIGO-Virgo Collaboration for estimating parameters of gravitational-wave bursts. We add simulated signals with four different morphologies (sine-Gaussians, Gaussians, white-noise bursts, and binary black hole signals) to simulated noise samples representing noise of the two Advanced LIGO detectors during their first observing run. We recover them with the BayesWave (BW) pipeline to study its accuracy in sky localization, waveform reconstruction, and estimation of model-independent waveform parameters. BW localizes sources with a level of accuracy comparable for all four morphologies, with the median separation of actual and estimated sky locations ranging from 25.1$^{\circ}$ to 30.3$^{\circ}$. This is a reasonable accuracy in the two-detector case, and is comparable to accuracies of other localization methods studied previously. As BW reconstructs generic transient signals with sine-Gaussian wavelets, it is unsurprising that BW performs the best in reconstructing sine-Gaussian and Gaussian waveforms. BW's accuracy in waveform reconstruction increases steeply with network signal-to-noise ratio (SNR$_{\rm net}$), reaching a $85\%$ and $95\%$ match between the reconstructed and actual waveform below SNR$_{\rm net} \approx 20$ and SNR$_{\rm net} \approx 50$, respectively, for all morphologies. BW's accuracy in estimating central moments of waveforms is only limited by statistical errors in the frequency domain, and is affected by systematic errors too in the time domain as BW cannot reconstruct low-amplitude parts of signals overwhelmed by noise. The figures of merit we introduce can be used in future characterizations of parameter estimation pipelines., Comment: 14 pages, 9 figures
Published: 2016
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14. Comparative study of engine dynamics for rolling and selective cylinder deactivation

Author: Fridrichová, Kateřina, Drápal, Lubomír, Raffai, Peter, Böhm, Michael, Fridrichová, Kateřina, Drápal, Lubomír, Raffai, Peter, and Böhm, Michael
Abstract: Strict emission limits have forced the automotive industry to reduce the carbon dioxide emissions produced by internal combustion engines. Emissions can also be reduced by increasing the efficiency of internal combustion engines by implementing technologies such as cylinder deactivation, the main benefit of which is a reduction in fuel consumption. However, there are some negative effects associated with this technology. There are two approaches to cylinder deactivation - selective and rolling. This paper focuses on the constraints of the technology and compares the two methods of cylinder deactivation in terms of torsional vibration, friction losses and load on the main bearings. The results for the selective and rolling cylinder deactivation are obtained from a verified multibody simulation of a four-cylinder engine.
Published: 2024

15. A Statistical Method to Search for Recoiling Supermassive Black Holes in Active Galactic Nuclei

Author: Raffai, Peter, Haiman, Zoltan, and Frei, Zsolt
Subjects: Astrophysics - Astrophysics of Galaxies
Abstract: We propose an observational test for gravitationally recoiling supermassive black holes (BHs) in active galactic nuclei, based on a correlation between the velocities of BHs relative to their host galaxies, |\Delta v|, and their obscuring dust column densities, \Sigma_{dust} (both measured along the line of sight). We use toy models for the distribution of recoil velocities, BH trajectories, and the geometry of obscuring dust tori in galactic centres, to simulate 2.5x10^5 random observations of recoiling quasars. BHs with recoil velocities comparable to the escape velocity from the galactic centre remain bound to the nucleus, and do not fully settle back to the centre of the torus due to dynamical friction in a typical quasar lifetime. We find that |\Delta v| and \Sigma_ {dust} for these BHs are positively correlated. For obscured (\Sigma_{dust}>0) and for partially obscured (0<\Sigma_{dust}<~2.3 g/m^2) quasars with |\Delta v|>=45 km/s, the sample correlation coefficient between log10(|\Delta v|) and \Sigma_{dust} is r_{45} = 0.28+/-0.02 and r_{45} = 0.13+/-0.02, respectively. Allowing for random +/-100 km/s errors in |\Delta v| unrelated to the recoil dilutes the correlation for the partially obscured quasars to r_{45} = 0.026+/-0.004 measured between |\Delta v| and \Sigma_{dust}. A random sample of >~3,500 obscured quasars with |\Delta v|>=45 km/s would allow rejection of the no-correlation hypothesis with 3 sigma significance 95% of the time. Finally, we find that the fraction of obscured quasars, F_{obs}(|\Delta v|), decreases with |\Delta v| from F_{obs}(<10 km/s)>~0.8 to F_{obs}(>10^3 km/s)<~0.4. This predicted trend can be compared to the observed fraction of type II quasars, and can further test combinations of recoil, trajectory, and dust torus models., Comment: 9 pages, 12 figures, accepted for publication in MNRAS
Published: 2015
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16. Comparative Study of Engine Dynamics for Rolling and Selective Cylinder Deactivation

Author: Fridrichová, Kateřina, primary, Drápal, Lubomír, additional, Raffai, Peter, additional, and Böhm, Michael, additional
Published: 2024
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17. Global Optimization for Future Gravitational Wave Detectors' Sites

Author: Hu, Yi-Ming, Raffai, Peter, Gondan, Laszlo, Heng, Ik Siong, Kelecsenyi, Nandor, Hendry, Martin, Marka, Zsuzsa, and Marka, Szabolcs
Subjects: Astrophysics - Instrumentation and Methods for Astrophysics
Abstract: We consider the optimal site selection of future generations of gravitational wave detectors. Previously, Raffai et al. optimized a 2-detector network with a combined figure of merit. This optimization was extended to networks with more than two detectors in a limited way by first fixing the parameters of all other component detectors. In this work we now present a more general optimization that allows the locations of all detectors to be simultaneously chosen. We follow the definition of Raffai et al. on the metric that defines the suitability of a certain detector network. Given the locations of the component detectors in the network, we compute a measure of the network's ability to distinguish the polarization, constrain the sky localization and reconstruct the parameters of a gravitational wave source. We further define the `flexibility index' for a possible site location, by counting the number of multi-detector networks with a sufficiently high Figure of Merit that include that site location. We confirm the conclusion of Raffai et al., that in terms of flexibility index as defined in this work, Australia hosts the best candidate site to build a future generation gravitational wave detector. This conclusion is valid for either a 3-detector network or a 5-detector network. For a 3-detector network site locations in Northern Europe display a comparable flexibility index to sites in Australia. However for a 5-detector network, Australia is found to be a clearly better candidate than any other location., Comment: 30 pages, 23 figures, 2 tables
Published: 2014
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18. Detecting Long-Duration Narrow-Band Gravitational Wave Transients Associated with Soft Gamma Repeater Quasi-Periodic Oscillations

Author: Murphy, David, Tse, Maggie, Raffai, Peter, Bartos, Imre, Khan, Rubab, Marka, Zsuzsa, Matone, Luca, Redwine, Keith, and Marka, Szabolcs
Subjects: Astrophysics - Instrumentation and Methods for Astrophysics, Astrophysics - High Energy Astrophysical Phenomena
Abstract: We have performed an in-depth concept study of a gravitational wave data analysis method which targets repeated long quasi-monochromatic transients (triggers) from cosmic sources. The algorithm concept can be applied to multi-trigger data sets in which the detector-source orientation and the statistical properties of the data stream change with time, and does not require the assumption that the data is Gaussian. Reconstructing or limiting the energetics of potential gravitational wave emissions associated with quasi-periodic oscillations (QPOs) observed in the X-ray lightcurve tails of soft gamma repeater flares might be an interesting endeavour of the future. Therefore we chose this in a simplified form to illustrate the flow, capabilities, and performance of the method. We investigate performance aspects of a multi-trigger based data analysis approach by using O(100 s) long stretches of mock data in coincidence with the times of observed QPOs, and by using the known sky location of the source. We analytically derive the PDF of the background distribution and compare to the results obtained by applying the concept to simulated Gaussian noise, as well as off-source playground data collected by the 4-km Hanford detector (H1) during LIGO's fifth science run (S5). We show that the transient glitch rejection and adaptive differential energy comparison methods we apply succeed in rejecting outliers in the S5 background data. Finally, we discuss how to extend the method to a network containing multiple detectors, and as an example, tune the method to maximize sensitivity to SGR 1806-20 flare times., Comment: 11 pages, 8 figures
Published: 2013
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19. Optimal Networks of Future Gravitational-Wave Telescopes

Author: Raffai, Péter, Gondán, László, Heng, Ik Siong, Kelecsényi, Nándor, Logue, Josh, Márka, Zsuzsa, and Márka, Szabolcs
Subjects: Astrophysics - Instrumentation and Methods for Astrophysics
Abstract: We aim to find the optimal site locations for a hypothetical network of 1-3 triangular gravitational-wave telescopes. We define the following N-telescope figures of merit (FoMs) and construct three corresponding metrics: (a) capability of reconstructing the signal polarization; (b) accuracy in source localization; and (c) accuracy in reconstructing the parameters of a standard binary source. We also define a combined metric that takes into account the three FoMs with practically equal weight. After constructing a geomap of possible telescope sites, we give the optimal 2-telescope networks for the four FoMs separately in example cases where the location of the first telescope has been predetermined. We found that based on the combined metric, placing the first telescope to Australia provides the most options for optimal site selection when extending the network with a second instrument. We suggest geographical regions where a potential second and third telescope could be placed to get optimal network performance in terms of our FoMs. Additionally, we use a similar approach to find the optimal location and orientation for the proposed LIGO-India detector within a five-detector network with Advanced LIGO (Hanford), Advanced LIGO (Livingston), Advanced Virgo, and KAGRA. We found that the FoMs do not change greatly in sites within India, though the network can suffer a significant loss in reconstructing signal polarizations if the orientation angle of an L-shaped LIGO-India is not set to the optimal value of ~58.2deg(+k*90deg) (measured counterclockwise from East to the bisector of the arms)., Comment: 28 pages, 18 figures
Published: 2013
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20. Multimessenger Science Reach and Analysis Method for Common Sources of Gravitational Waves and High-energy Neutrinos

Author: Baret, Bruny, Bartos, Imre, Bouhou, Boutayeb, Chassande-Mottin, Eric, Corsi, Alessandra, Di Palma, Irene, Donzaud, Corinne, Drago, Marco, Finley, Chad, Jones, Gareth, Klimenko, Sergey, Kouchner, Antoine, Márka, Szabolcs, Márka, Zsuzsa, Moscoso, Luciano, Papa, Maria Alessandra, Pradier, Thierry, Prodi, Giovanni, Raffai, Peter, Re, Virginia, Rollins, Jameson, Salemi, Francesco, Sutton, Patrick, Tse, Maggie, Van Elewyck, Véronique, and Vedovato, Gabriele
Subjects: Astrophysics - High Energy Astrophysical Phenomena, Astrophysics - Cosmology and Extragalactic Astrophysics
Abstract: We present the baseline multimessenger analysis method for the joint observations of gravitational waves (GW) and high-energy neutrinos (HEN), together with a detailed analysis of the expected science reach of the joint search. The analysis method combines data from GW and HEN detectors, and uses the blue-luminosity-weighted distribution of galaxies. We derive expected GW+HEN source rate upper limits for a wide range of source parameters covering several emission models. Using published sensitivities of externally triggered searches, we derive joint upper limit estimates both for the ongoing analysis with the initial LIGO-Virgo GW detectors with the partial IceCube detector (22 strings) HEN detector and for projected results to advanced LIGO-Virgo detectors with the completed IceCube (86 strings). We discuss the constraints these upper limits impose on some existing GW+HEN emission models., Comment: *Corresponding author: ibartos@phys.columbia.edu
Published: 2011
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21. Opportunity to Test non-Newtonian Gravity Using Interferometric Sensors with Dynamic Gravity Field Generators

Author: Raffai, Peter, Szeifert, Gabor, Matone, Luca, Aso, Yoichi, Bartos, Imre, Marka, Zsuzsa, Ricci, Fulvio, and Marka, Szabolcs
Subjects: General Relativity and Quantum Cosmology, Astrophysics - Instrumentation and Methods for Astrophysics
Abstract: We present an experimental opportunity for the future to measure possible violations to Newton's 1/r^2 law in the 0.1-10 meter range using Dynamic gravity Field Generators (DFG) and taking advantage of the exceptional sensitivity of modern interferometric techniques. The placement of a DFG in proximity to one of the interferometer's suspended test masses generates a change in the local gravitational field that can be measured at a high signal to noise ratio. The use of multiple DFGs in a null experiment configuration allows to test composition independent non-Newtonian gravity significantly beyond the present limits. Advanced and third-generation gravitational-wave detectors are representing the state-of-the-art in interferometric distance measurement today, therefore we illustrate the method through their sensitivity to emphasize the possible scientific reach. Nevertheless, it is expected that due to the technical details of gravitational-wave detectors, DFGs shall likely require dedicated custom configured interferometry. However, the sensitivity measure we derive is a solid baseline indicating that it is feasible to consider probing orders of magnitude into the pristine parameter well beyond the present experimental limits significantly cutting into the theoretical parameter space., Comment: 9 pages, 6 figures; Physical Review D, vol. 84, Issue 8, id. 082002
Published: 2011
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22. Bounding the Time Delay between High-energy Neutrinos and Gravitational-wave Transients from Gamma-ray Bursts

Author: Baret, Bruny, Bartos, Imre, Bouhou, Boutayeb, Corsi, Alessandra, Di Palma, Irene, Donzaud, Corinne, Van Elewyck, Véronique, Finley, Chad, Jones, Gareth, Kouchner, Antoine, Màrka, Szabolcs, Màrka, Zsuzsa, Moscoso, Luciano, Chassande-Mottin, Eric, Papa, Maria Alessandra, Pradier, Thierry, Raffai, Peter, Rollins, Jameson, and Sutton, Patrick
Subjects: Astrophysics - High Energy Astrophysical Phenomena, Astrophysics - Cosmology and Extragalactic Astrophysics, General Relativity and Quantum Cosmology
Abstract: We derive a conservative coincidence time window for joint searches of gravita-tional-wave (GW) transients and high-energy neutrinos (HENs, with energies above 100GeV), emitted by gamma-ray bursts (GRBs). The last are among the most interesting astrophysical sources for coincident detections with current and near-future detectors. We take into account a broad range of emission mechanisms. We take the upper limit of GRB durations as the 95% quantile of the T90's of GRBs observed by BATSE, obtaining a GRB duration upper limit of ~150s. Using published results on high-energy (>100MeV) photon light curves for 8 GRBs detected by Fermi LAT, we verify that most high-energy photons are expected to be observed within the first ~150s of the GRB. Taking into account the breakout-time of the relativistic jet produced by the central engine, we allow GW and HEN emission to begin up to 100s before the onset of observable gamma photon production. Using published precursor time differences, we calculate a time upper bound for precursor activity, obtaining that 95% of precursors occur within ~250s prior to the onset of the GRB. Taking the above different processes into account, we arrive at a time window of tHEN - tGW ~ [-500s,+500s]. Considering the above processes, an upper bound can also be determined for the expected time window of GW and/or HEN signals coincident with a detected GRB, tGW - tGRB ~ tHEN - tGRB ~ [-350s,+150s].
Published: 2011
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23. Long gravitational-wave transients and associated detection strategies for a network of terrestrial interferometers

Author: Thrane, Eric, Kandhasamy, Shivaraj, Ott, Christian D, Anderson, Warren G, Christensen, Nelson L, Coughlin, Michael W, Dorsher, Steven, Giampanis, Stefanos, Mandic, Vuk, Mytidis, Antonis, Prestegard, Tanner, Raffai, Peter, and Whiting, Bernard
Subjects: Astrophysics - Instrumentation and Methods for Astrophysics, General Relativity and Quantum Cosmology
Abstract: Searches for gravitational waves (GWs) traditionally focus on persistent sources (e.g., pulsars or the stochastic background) or on transients sources (e.g., compact binary inspirals or core-collapse supernovae), which last for timescales of milliseconds to seconds. We explore the possibility of long GW transients with unknown waveforms lasting from many seconds to weeks. We propose a novel analysis technique to bridge the gap between short O(s) burst analyses and persistent stochastic analyses. Our technique utilizes frequency-time maps of GW strain cross-power between two spatially separated terrestrial GW detectors. The application of our cross-power statistic to searches for GW transients is framed as a pattern recognition problem, and we discuss several pattern-recognition techniques. We demonstrate these techniques by recovering simulated GW signals in simulated detector noise. We also recover environmental noise artifacts, thereby demonstrating a novel technique for the identification of such artifacts in GW interferometers. We compare the efficiency of this framework to other techniques such as matched filtering.
Published: 2010
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24. Recovering a spinning inspiralling compact binary waveform immersed in LIGO-like noise with spinning templates

Author: Veréb, László, Keresztes, Zoltán, Raffai, Péter, Mészáros, Szabolcs, and Gergely, László Á.
Subjects: General Relativity and Quantum Cosmology, Astrophysics - Cosmology and Extragalactic Astrophysics
Abstract: We investigate the recovery chances of highly spinning waveforms immersed in LIGO S5-like noise by performing a matched filtering with 10^6 randomly chosen spinning waveforms generated with the LAL package. While the masses of the compact binary are reasonably well recovered (slightly overestimated), the same does not hold true for the spins. We show the best fit matches both in the time-domain and the frequency-domain. These encompass some of the spinning characteristics of the signal, but far less than what would be required to identify the astrophysical parameters of the system. An improvement of the matching method is necessary, though may be difficult due to the noisy signal., Comment: 5 pages, 1 figure + 4 figure panels; Proceedings of the Eight Edoardo Amaldi Conference on Gravitational Waves (Amaldi8), New York, 2009; to be published in J. Phys.: Conf. Series (JPCS)
Published: 2009
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25. The Hitchhiker’s Guide to the Galaxy Catalog Approach for Dark Siren Gravitational-wave Cosmology

Author: Gair, Jonathan R., primary, Ghosh, Archisman, additional, Gray, Rachel, additional, Holz, Daniel E., additional, Mastrogiovanni, Simone, additional, Mukherjee, Suvodip, additional, Palmese, Antonella, additional, Tamanini, Nicola, additional, Baker, Tessa, additional, Beirnaert, Freija, additional, Bilicki, Maciej, additional, Chen, Hsin-Yu, additional, Dálya, Gergely, additional, Ezquiaga, Jose Maria, additional, Farr, Will M., additional, Fishbach, Maya, additional, Garcia-Bellido, Juan, additional, Ghosh, Tathagata, additional, Huang, Hsiang-Yu, additional, Karathanasis, Christos, additional, Leyde, Konstantin, additional, Hernandez, Ignacio Magaña, additional, Noller, Johannes, additional, Pierra, Gregoire, additional, Raffai, Peter, additional, Romano, Antonio Enea, additional, Seglar-Arroyo, Monica, additional, Steer, Danièle A., additional, Turski, Cezary, additional, Vaccaro, Maria Paola, additional, and Vallejo-Peña, Sergio Andrés, additional
Published: 2023
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26. The Hitchhiker’s Guide to the Galaxy Catalog Approach for Dark Siren Gravitational-wave Cosmology

Author: Gair, Jonathan R., Ghosh, Archisman, Gray, Rachel, Holz, Daniel E., Mastrogiovanni, Simone, Mukherjee, Suvodip, Palmese, Antonella, Tamanini, Nicola, Baker, Tessa, Beirnaert, Freija, Bilicki, Maciej, Chen, Hsin-yu, Dálya, Gergely, Ezquiaga, Jose Maria, Farr, Will M., Fishbach, Maya, Garcia-bellido, Juan, Ghosh, Tathagata, Huang, Hsiang-yu, Karathanasis, Christos, Leyde, Konstantin, Hernandez, Ignacio Magaña, Noller, Johannes, Pierra, Gregoire, Raffai, Peter, Romano, Antonio Enea, Seglar-arroyo, Monica, Steer, Danièle A., Turski, Cezary, Vaccaro, Maria Paola, and Vallejo-peña, Sergio Andrés
Published: 2023
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27. The Influence of Rotor Unbalance on Turbocharger Rotor Dynamics

Author: Knotek Jiří, Novotný Pavel, Maršálek Ondřej, Raffai Peter, and Dlugoš Jozef
Subjects: Turbodmychadlo, Dynamika Rotoru, Nevývaha, Ložisko S Plovoucím Pouzdrem, Turbocharger, Rotor Dynamics, Unbalance, Floating Ring Bearing, Machine design and drawing, TJ227-240
Abstract: This paper describes the influence of an unbalance on turbocharger rotor dynamics. The structural model of the turbocharger rotor and the hydrodynamic model of the journal floating ring bearing are described and assembled in multibody dynamics software. Moreover, the paper presents various results describing rotor dynamics where the influence of an unbalance is discussed.
Published: 2015
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28. Selection Of Analytical Computational Model Of Contact Pressure

Author: Maršálek Ondřej, Vopařil Jan, Raffai Peter, and Novotný Pavel
Subjects: FEM, FDM, CONTACT PRESSURE, SURFACE DEFLECTION, ROUGH SURFACE, MKP, MKD, KONTAKTNÍ TLAK, PROLNUTÍ POVRCHŮ, DRSNOST POVRCHU, Machine design and drawing, TJ227-240
Abstract: This paper presents a comparison of two contact pressure calculation methods between two real rough surfaces: a calculation based on FEM (Finite Element Method) using commercial software tool ANSYS and a calculation based on FDM (Finite Difference Method) using analytical functions implemented in programing tool MATLAB. This comparison, lately, leads to the selection of the most appropriate analytical contact model useful for time-effective and precise contact pressure determination. Surface data for numerical simulations are obtained by optical profilometry. For the case of the modelling process of 3D FEM models of rough surfaces the description of their building is included in this article. Furthermore, this paper discusses all challenges connected with the convergence of such simulations and essential post-processing of FEM simulation results, together with their comparison, along the results obtained by user-written MATLAB functions.
Published: 2015
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29. Role Of Computational Simulations In The Design Of Piston Rings

Author: Novotný Pavel, Raffai Peter, Dlugoš Jozef, Maršálek Ondřej, and Knotek Jiří
Subjects: MIXED LUBRICATION, PISTON RING, PARAMETRIC STUDY, OIL FILM FORMULATION, SMÍŠENÉ MAZÁNÍ, PÍSTNÍ KROUŽEK, PARAMETRICKÁ STUDIE, TVORBA OLEJOVÉVRSTVY, Machine design and drawing, TJ227-240
Abstract: The paper presents computational approaches using modern strategies for a dynamic piston ring solution as a fluid structural problem. Computational model outputs can be used to understand design parameter influences on defined results of a primarily integral character. Piston ring dynamics incorporates mixed lubrication conditions, the influence of surface roughness on oil film lubrication, the influence of ring movement on gas dynamics, oil film formulation on a cylinder liner and other significant influences. The solution results are presented for several parameters of SI engine piston rings.
Published: 2015
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30. Multi Body Analysis Of A Turbocharger Supported By A Fully Floating Ring Bearing

Author: Knotek Jiří, Novotný Pavel, Maršálek Ondřej, and Raffai Peter
Subjects: TURBOCHARGER, ROTOR DYNAMICS, FULLY FLOATING RING BEARING, TURBODMYCHADLO, DYNAMIKA ROTORU, LOŽISKO S PLOVOUCÍM POUZDREM, Machine design and drawing, TJ227-240
Abstract: This paper describes an advanced tool for turbocharger rotor dynamics analysis and its development. The hydrodynamic model of the journal bearing based on Reynolds equation is presented. The paper also describes assembly of the turbocharger rotor model. At the end the basic results are presented and analyzed.
Published: 2015
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31. Prospects for reconstructing the gravitational-wave signals from core-collapse supernovae with Advanced LIGO-Virgo and the BayesWave algorithm

Author: Raza, Nayyer, primary, McIver, Jess, additional, Dálya, Gergely, additional, and Raffai, Peter, additional
Published: 2022
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32. Bayesian reconstruction of gravitational-wave signals from binary black holes with nonzero eccentricities

Author: Dálya, Gergely, primary, Raffai, Peter, additional, and Bécsy, Bence, additional
Published: 2021
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33. Interpreting gravitational-wave burst detections: constraining source properties without astrophysical models

Author: Bécsy, Bence, primary, Raffai, Peter, additional, Gill, Kiranjyot, additional, Littenberg, Tyson B, additional, Millhouse, Margaret, additional, and Szczepańczyk, Marek J, additional
Published: 2020
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34. Accuracy of Estimating Highly Eccentric Binary Black Hole Parameters with Gravitational-wave Detections

Author: Gondan, Laszlo, Kocsis, Bence, Raffai, Peter, and Frei, Zsolt
Subjects: High Energy Astrophysical Phenomena (astro-ph.HE), Physics, Orbital elements, 010308 nuclear & particles physics, Gravitational wave, media_common.quotation_subject, FOS: Physical sciences, Astronomy and Astrophysics, Orbital eccentricity, General Relativity and Quantum Cosmology (gr-qc), Astrophysics, 01 natural sciences, General Relativity and Quantum Cosmology, LIGO, Orbit, Binary black hole, Space and Planetary Science, 0103 physical sciences, Astrophysics::Earth and Planetary Astrophysics, KAGRA, Eccentricity (behavior), Astrophysics - High Energy Astrophysical Phenomena, 010303 astronomy & astrophysics, media_common
Abstract: Mergers of stellar-mass black holes on highly eccentric orbits are among the targets for ground-based gravitational-wave detectors, including LIGO, VIRGO, and KAGRA. These sources may commonly form through gravitational-wave emission in high velocity dispersion systems or through the secular Kozai-Lidov mechanism in triple systems. Gravitational waves carry information about the binaries' orbital parameters and source location. Using the Fisher matrix technique, we determine the measurement accuracy with which the LIGO-VIRGO-KAGRA network could measure the source parameters of eccentric binaries using a matched filtering search of the repeated burst and eccentric inspiral phases of the waveform. We account for general relativistic precession and the evolution of the orbital eccentricity and frequency during the inspiral. We find that the signal-to-noise ratio and the parameter measurement accuracy may be significantly higher for eccentric sources than for circular sources. This increase is sensitive to the initial pericenter distance, the initial eccentricity, and component masses. For instance, compared to a 30 Msun-30 Msun non-spinning circular binary, the chirp mass and sky localization accuracy can improve for an initially highly eccentric binary by a factor of ~129 (38) and ~2 (11) assuming an initial pericenter distance of 20 Mtot (10 Mtot)., Comment: 25 pages, 9 figures, version accepted for publication in ApJ
Published: 2018
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35. Full band all-sky search for periodic gravitational waves in the O1 LIGO data

Author: Abbott, Benjamin P., Abbott, Rich, Abbott, Thomas D., Acernese, Fausto, Ackley, Kendall, Adams, Carl, Adams, Thomas, Addesso, Paolo, Adhikari, Rana X., Adya, Vaishali B., Affeldt, Christoph, Afrough, Mohammad, Agarwal, Bhanu, Agathos, Michalis, Agatsuma, Kazuhiro, Aggarwal, Nancy, Aguiar, Odylio D., Aiello, Lorenzo, Ain, Anirban, Allen, Bruce, Allen, Gabrielle, Allocca, Annalisa, Altin, Paul A., Amato, Alex, Ananyeva, Alena, Anderson, Stuart B., Anderson, Warren G., Angelova, Svetoslava V., Antier, Sarah, Appert, Stephen, Arai, Koji, Araya, Melody C., Areeda, Joseph S., Arnaud, Nicolas, Ascenzi, Stefano, Ashton, Gregory, Ast, M., Aston, Stuart M., Astone, Pia, Atallah, Dany V., Aufmuth, Peter, Aulbert, Carsten, AultONeal, K., Austin, Corey, Avila-Alvarez, A., Babak, Stanislav, Bacon, Philippe, Bader, Maria K.M., Bae, Sangwook, Baker, Paul T., Baldaccini, Francesca, Ballardin, Giulio, Ballmer, Stefan W., Banagiri, Sharan, Barayoga, Juan C., Barclay, Sheena E., Barish, Barry C., Barker, David, Barkett, Kevin, Barone, Fabrizio, Barr, Bryan, Barsotti, Lisa, Barsuglia, Matteo, Barta, Daniel, Bartlett, Jeffrey, Bartos, Imre, Bassiri, Riccardo, Basti, Andrea, Batch, James C., Bawaj, Mateusz, Bayley, Joseph C., Bazzan, Marco, Bécsy, Bence, Beer, Christian, Bejger, Michal, Belahcene, Imene, Bell, Angus S., Berger, Beverly K., Bergmann, Gerald, Bero, John J., Berry, Christopher P.L., Bersanetti, Diego, Bertolini, Alessandro, Betzwieser, Joseph, Bhagwat, Swetha, Bhandare, Rohan, Bilenko, Igor A., Billingsley, Garilynn, Billman, Chris R., Birch, Jeremy, Birney, Ross, Birnholtz, Ofek, Biscans, Sebastien, Biscoveanu, Sylvia, Bisht, Aparna, Bitossi, Massimiliano, Biwer, Christopher, Bizouard, Marieanne A., Blackburn, J.K., Blackman, Jonathan, Blair, Carl D., Blair, David G., Blair, Ryan M., Bloemen, Steven, Bock, Oliver, Bode, Nina, Boer, Michel, Bogaert, Gilles, Bohe, Alejandro, Bondu, Francois, Bonilla, Edgard, Bonnand, Romain, Boom, Boris A., Bork, Rolf, Boschi, Valerio, Bose, Sukanta, Bossie, Ken, Bouffanais, Yann, Bozzi, Antonella, Bradaschia, Carlo, Brady, Patrick R., Branchesi, Marica, Brau, Jim E., Briant, Tristan, Brillet, Alain, Brinkmann, Marc, Brisson, Violette, Brockill, Patrick, Broida, Jacob E., Brooks, Aidan F., Brown, Duncan A., Brown, Daniel D., Brunett, Sharon, Buchanan, Christopher C., Buikema, Aaron, Bulik, Tomasz, Bulten, Henk J., Buonanno, Alessandra, Buskulic, Damir, Buy, Christelle, Byer, Robert L., Cabero, Miriam, Cadonati, Laura, Cagnoli, Giampietro, Cahillane, Craig, Calderón Bustillo, J., Callister, Thomas A., Calloni, Enrico, Camp, Jordan B., Canepa, Maurizio, Canizares, Priscilla, Cannon, Kipp C., Cao, H., Cao, Junwei, Capano, Collin D., Capocasa, Eleonora, Carbognani, Franco, Caride, Santiago, Carney, Matthew F., Casanueva Diaz, J., Casentini, Claudio, Caudill, Sarah, Cavaglià, Marco, Cavalier, Fabien, Cavalieri, Roberto, Cella, Giancarlo, Cepeda, Christian B., Cerdá-Durán, P., Cerretani, Giovanni, Cesarini, Elisabetta, Chamberlin, Sydney J., Chan, Manleong, Chao, Shiuh, Charlton, Philip, Chase, Eve, Chassande-Mottin, E., Chatterjee, Deep, Cheeseboro, Belinda D., Chen, H.Y., Chen, Xu, Chen, Yanbei, Cheng, H.-P., Chia, Hanyu Y., Chincarini, Andrea, Chiummo, Antonino, Chmiel, Theresa, Cho, Heesuk S., Cho, M., Chow, Jong H., Christensen, Nelson, Chu, Qi, Chua, Alvin J.K., Chua, Sheon, Chung, A.K.W., Chung, Shinkee, Ciani, Giacomo, Ciecielag, P., Ciolfi, Riccardo, Cirelli, Carissa E., Cirone, Alessio, Clara, Filiberto, Clark, James A., Clearwater, Patrick, Cleva, Frederic, Cocchieri, Camillo, Coccia, Eugenio, Cohadon, P.-F., Cohen, David, Colla, Alberto, Collette, Christophe G., Cominsky, Lynn R., Constancio, M., Conti, Livia, Cooper, Sam J., Corban, Paul, Corbitt, Thomas R., Cordero-Carrión, I., Corley, Kenneth R., Cornish, Neil, Corsi, Alessandra, Cortese, Stefano, Costa, Cesar A., Coughlin, Eric T., Coughlin, Michael W., Coughlin, Scott B., Coulon, J.-P., Countryman, Stefan T., Couvares, Peter, Covas, Pep B., Cowan, Erika E., Coward, David M., Cowart, Matthew J., Coyne, Dennis C., Coyne, Robert, Creighton, Jolien D.E., Creighton, Teviet D., Cripe, Jonathan, Crowder, Sgwynne G., Cullen, Torrey J., Cumming, Alan, Cunningham, Liam, Cuoco, Elena, Dal Canton, Tito, Dálya, Gergely, Danilishin, Stefan L., D'Antonio, S., Danzmann, Karsten, Dasgupta, Arnab, Da Silva Costa, C.F., Dattilo, Vincenzo, Dave, Ishant, Davier, Michel, Davis, Derek, Daw, Edward J., Day, Brian, De, Soumi, Debra, D., Degallaix, Jerome, De Laurentis, M., Deléglise, Samuel, Del Pozzo, W., Demos, Nicholas, Denker, Timo, Dent, Thomas, De Pietri, R., Dergachev, Vladimir, De Rosa, R., DeRosa, R.T., De Rossi, C., DeSalvo, R., de Varona, O., Devenson, Jan, Dhurandhar, Sanjeev, Díaz, Mario C., Di Fiore, L., Di Giovanni, M., Di Girolamo, T., Di Lieto, A., Di Pace, S., Di Palma, I., Di Renzo, F., Doctor, Zoheyr, Dolique, Vincent, Donovan, Fred, Dooley, Katherine L., Doravari, Suresh, Dorosh, O., Dorrington, Iain, Douglas, Rebecca, Dovale Álvarez, M., Downes, Thomas P., Drago, Marco, Dreissigacker, Christoph, Driggers, Jenne C., Du, Zhihui, Ducrot, Marine, Dupej, Peter, Dwyer, Sheila E., Edo, Tega B., Edwards, Matthew C., Effler, Anamaria, Eggenstein, H.-B., Ehrens, Phil, Eichholz, Johannes, Eikenberry, Stephen S., Eisenstein, Robert A., Essick, Reed C., Estevez, Dimitri, Etienne, Zachariah B., Etzel, Todd, Evans, Matthew, Evans, Tom M., Factourovich, Maxim, Fafone, Viviana, Fair, Hannah, Fairhurst, Stephen, Fan, Xilong, Farinon, Stefania, Farr, Benjamin, Farr, Will M., Fauchon-Jones, E.J., Favata, Marc, Fays, Maxime, Fee, Campbell, Fehrmann, Henning, Feicht, Jon, Fejer, Martin M., Fernandez-Galiana, A., Ferrante, Isidoro, Ferreira, Elvis C., Ferrini, Federico, Fidecaro, Francesco, Finstad, Daniel, Fiori, Irene, Fiorucci, Donatella, Fishbach, Maya, Fisher, Ryan P., Fitz-Axen, M., Flaminio, Raffaele, Fletcher, Mark, Fong, Heather, Font, J.A., Forsyth, Perry W.F., Forsyth, Steven S., Fournier, J.-D., Frasca, Sergio, Frasconi, Franco, Frei, Zsolt, Freise, Andreas, Frey, Raymond, Frey, Valentin, Fries, Eric M., Fritschel, Peter, Frolov, Valery V., Fulda, Paul, Fyffe, Michael, Gabbard, Hunter, Gadre, Bhooshan U., Gaebel, Sebastian M., Gair, Jonathan R., Gammaitoni, Luca, Ganija, Miftar R., Gaonkar, Sharad G., Garcia-Quiros, C., Garufi, Fabio, Gateley, B., Gaudio, Sergio, Gaur, Gurudatt, Gayathri, V., Gehrels, Neil, Gemme, Gianluca, Genin, Eric, Gennai, Alberto, George, Daniel, George, Jogy, Gergely, Laszlo, Germain, Vincent, Ghonge, Sudarshan, Ghosh, Abhirup, Ghosh, Archisman, Ghosh, Shaon, Giaime, Joe A., Giardina, K.D., Giazotto, Adalberto, Gill, Kiranjyot, Glover, Lamar, Goetz, Evan, Goetz, Ryan, Gomes, Sandra, Goncharov, Boris, González, Gabriela, Gonzalez Castro, J.M., Gopakumar, A., Gorodetsky, Michael L., Gossan, Sarah E., GOSSELIN, Matthieu, Gouaty, Romain, Grado, Aniello, Graef, Christian, Granata, Massimo, Grant, Alastair, Gras, Slawomir, Gray, Corey, Greco, Giuseppe, Green, Anna C., Gretarsson, Elizabeth M., Groot, Paul, Grote, Hartmut, Grunewald, Steffen, Gruning, Pierre, Guidi, Gianluca M., Guo, Xiangyu, Gupta, Anuradha, Gupta, Manojipr K., Gushwa, Kaitlin E., Gustafson, Eric K., Gustafson, R., Halim, O., Hall, Bernard R., Hall, Evan D., Hamilton, Eleanor Z., Hammond, Giles, Haney, Maria, Hanke, Manuela M., Hanks, Jonathan, Hanna, Chad, Hannam, Mark D., Hannuksela, Otto A., Hanson, Joe, Hardwick, Terra, Harms, Jan, Harry, Gregg M., Harry, Ian W., Hart, Martin J., Haster, C.-J., Haughian, Karen, Healy, James, Heidmann, Antoine, Heintze, Matthew C., Heitmann, Henrich, Hello, Patrice, Hemming, Gary, Hendry, Martin, Heng, I.S., Hennig, J., Heptonstall, Alastair W., Heurs, Michele, Hild, Stefan, Hinderer, Tanja, Hoak, Daniel, Hofman, David, Holt, Kathy, Holz, Daniel E., Hopkins, Paul, Horst, Christian, Hough, James, Houston, Ewan A., Howell, Eric J., Hreibi, A., Hu, Yiming M., Huerta, Eliu A., Huet, Dominique, Hughey, Brennan, Husa, Sascha, Huttner, Sabina H., Huynh-Dinh, T., Indik, Nathaniel, Inta, Ra, Intini, Giuseppe, Isa, Hafizah N., Isac, J.-M., Isi, Max, Iyer, Bala R., Izumi, Kiwamu, Jacqmin, Thibaut, Jani, Karan, Jaranowski, Piotr, Jawahar, Sharat, Jiménez-Forteza, F., Johnson, Warren W., Jones, D.I., Jones, Russell, Jonker, Reinier J.G., Ju, L., Junker, Jonas, Kalaghatgi, Chinmay V., Kalogera, Vassiliki, Kamai, Brittany, Kandhasamy, Shivaraj, Kang, Gungwon, Kanner, Jonah B., Kapadia, Shasvath J., Karki, Sudarshan, Karvinen, Kai S., Kasprzack, Marie, Katolik, Michael, Katsavounidis, Erik, Katzman, William, Kaufer, Steffen, Kawabe, Keita, Kéfélian, Fabien, Keitel, David, Kemball, Athol J., Kennedy, Ross, Kent, Christopher, Key, Joey S., Khalili, Farit Y., Khan, I., Khan, Sebastian, Khan, Ziauddin, Khazanov, Efim A., Kijbunchoo, Nutsinee, Kim, Chunglee, Kim, Jeongcho C., Kim, Kyungmin, Kim, Won, Kim, Whansun S., Kim, Y.-M., Kimbrell, Seth J., King, Eleanor J., King, Peter J., Kinley-Hanlon, M., Kirchhoff, Robin, Kissel, Jeffrey S., Kleybolte, Lisa, Klimenko, Sergei, Knowles, Tyler D., Koch, Philip, Koehlenbeck, Sina M., Koley, Soumen, Kondrashov, Veronica, Kontos, Antonios, Korobko, Mikhail, Korth, William Z., Kowalska, Izabela, Kozak, Dan B., Krämer, Christina, Kringel, Volker, Krishnan, Badri, Królak, Andrzej, Kuehn, Gerrit, Kumar, Prayush, Kumar, Rakesh, Kumar, Sumit, Kuo, L., Kutynia, Adam, Kwang, Shawn, Lackey, Benjamin D., Lai, K.H., Landry, Michael, Lang, Ryan N., Lange, Jacob, Lantz, Brian, Lanza, Robert K., Lartaux-Vollard, A., Lasky, Paul D., Laxen, Michael, Lazzarini, Albert, Lazzaro, Claudia, Leaci, Paola, Leavey, Sean, Lee, C.H., Lee, Hyunkyu K., Lee, H.M., Lee, Hyungwon W., Lee, K., Lehmann, Johannes, Lenon, Amber, Leonardi, Matteo, Leroy, Nicolas, Letendre, Nicolas, Levin, Yuri, Li, Tjonnie G.F., Linker, Seth D., Littenberg, Tyson B., Liu, J., Lo, R.K.L., Lockerbie, Nick A., London, Lionel T., Lord, Jaysin E., Lorenzini, Matteo, Loriette, Vincent, Lormand, Marc, Losurdo, 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Max, Iyer, Bala R., Izumi, Kiwamu, Jacqmin, Thibaut, Jani, Karan, Jaranowski, Piotr, Jawahar, Sharat, Jiménez-Forteza, F., Johnson, Warren W., Jones, D.I., Jones, Russell, Jonker, Reinier J.G., Ju, L., Junker, Jonas, Kalaghatgi, Chinmay V., Kalogera, Vassiliki, Kamai, Brittany, Kandhasamy, Shivaraj, Kang, Gungwon, Kanner, Jonah B., Kapadia, Shasvath J., Karki, Sudarshan, Karvinen, Kai S., Kasprzack, Marie, Katolik, Michael, Katsavounidis, Erik, Katzman, William, Kaufer, Steffen, Kawabe, Keita, Kéfélian, Fabien, Keitel, David, Kemball, Athol J., Kennedy, Ross, Kent, Christopher, Key, Joey S., Khalili, Farit Y., Khan, I., Khan, Sebastian, Khan, Ziauddin, Khazanov, Efim A., Kijbunchoo, Nutsinee, Kim, Chunglee, Kim, Jeongcho C., Kim, Kyungmin, Kim, Won, Kim, Whansun S., Kim, Y.-M., Kimbrell, Seth J., King, Eleanor J., King, Peter J., Kinley-Hanlon, M., Kirchhoff, Robin, Kissel, Jeffrey S., Kleybolte, Lisa, Klimenko, Sergei, Knowles, Tyler D., Koch, Philip, Koehlenbeck, Sina M., Koley, Soumen, Kondrashov, Veronica, Kontos, Antonios, Korobko, Mikhail, Korth, William Z., Kowalska, Izabela, Kozak, Dan B., Krämer, Christina, Kringel, Volker, Krishnan, Badri, Królak, Andrzej, Kuehn, Gerrit, Kumar, Prayush, Kumar, Rakesh, Kumar, Sumit, Kuo, L., Kutynia, Adam, Kwang, Shawn, Lackey, Benjamin D., Lai, K.H., Landry, Michael, Lang, Ryan N., Lange, Jacob, Lantz, Brian, Lanza, Robert K., Lartaux-Vollard, A., Lasky, Paul D., Laxen, Michael, Lazzarini, Albert, Lazzaro, Claudia, Leaci, Paola, Leavey, Sean, Lee, C.H., Lee, Hyunkyu K., Lee, H.M., Lee, Hyungwon W., Lee, K., Lehmann, Johannes, Lenon, Amber, Leonardi, Matteo, Leroy, Nicolas, Letendre, Nicolas, Levin, Yuri, Li, Tjonnie G.F., Linker, Seth D., Littenberg, Tyson B., Liu, J., Lo, R.K.L., Lockerbie, Nick A., London, Lionel T., Lord, Jaysin E., Lorenzini, Matteo, Loriette, Vincent, Lormand, Marc, Losurdo, Giovanni, Lough, James D., Lovelace, Geoffrey, Lück, Harald, Lumaca, Diana, Lundgren, Andrew P., Lynch, Ryan, Ma, Y., Macas, Ronaldas, Macfoy, Sean, Machenschalk, Bernd, Macinnis, M., Macleod, Duncan M., Magaña Hernandez, I., Magaña-Sandoval, F., Magaña Zertuche, L., Magee, Ryan M., Majorana, Ettore, Maksimovic, Ivan, Man, N., Mandic, Vuk, Mangano, Valentina, Mansell, Georgia L., Manske, Michael, Mantovani, Maddalena, Marchesoni, Fabio, Marion, Frederique, Márka, Szabolcs, Márka, Zsuzsanna, Markakis, Charalampos, Markosyan, Ashot S., Markowitz, Aaron, Maros, E., Marquina, Antonio, Martelli, Filippo, Martellini, Lionel, Martin, Ian W., Martin, Rodica M., Martynov, Denis V., Mason, Ken, Massera, Elena, Masserot, Alain, Massinger, Thomas J., Masso-Reid, M., Mastrogiovanni, Simone, Matas, Andrew, Matichard, Fabrice, Matone, Luca, Mavalvala, Nergis, Mazumder, Nairwita, McCarthy, R., Mcclelland, D.E., Mccormick, S., McCuller, L., McGuire, S.C., Mcintyre, G., Mciver, J., McManus, David J., McNeill, L., McRae, T., McWilliams, S.T., Meacher, Duncan, Meadors, Grant D., Mehmet, Moritz, Meidam, Jeroen, Mejuto-Villa, E., Melatos, Andrew, Mendell, Gregory, Mercer, R.A., Merilh, Edmond L., Merzougui, Mourad, Meshkov, Syd, Messenger, Chris, Messick, Cody, Metzdorff, R., Meyers, Patrick M., Miao, Haixing, Michel, Christophe, Middleton, Hannah, Mikhailov, Eugeniy E., Milano, Leopoldo, Miller, Andrewlawrence L., Miller, Brandon B., Miller, John, Millhouse, Meg, Milovich-Goff, M.C., Minazzoli, Olivier, Minenkov, Yuri, Ming, Jing, Mishra, Chandra, Mitra, Sanjit, Mitrofanov, Valery P., Mitselmakher, Guenakh, Mittleman, Richard, Moffa, Donald, Moggi, Andrea, Mogushi, Kentaro, Mohan, Martin, Mohapatra, S.R.P., Montani, Matteo, Moore, Christopher J., Moraru, Dan, Moreno, Gerardo, Morriss, Sean R., Mours, Benoit, Mow-Lowry, C.M., Mueller, Guido, Muir, Alistair W., Mukherjee, Arunava, Mukherjee, Debnandini, Mukherjee, Soma, Mukund, Nikhil, Mullavey, Adam, Munch, Jesper, Muñiz, Erik A., Muratore, Martina, Murray, Peter G., Napier, Kate, Nardecchia, Ilaria, Naticchioni, Luca, Nayak, Rajesh K., Neilson, Joshua, Nelemans, Gijs, Nelson, Timothy J.N., Nery, Marina, Neunzert, Ansel, Nevin, Lydia, Newport, Jonathan M., Newton, Gavin, Ng, K.Y., Nguyen, Thanh T., Nichols, David, Nielsen, Alex B., Nissanke, Samaya, Nitz, Alex, Noack, Andreas, Nocera, Flavio, Nolting, David, North, Chris, Nuttall, Laura K., Oberling, Jason, O'Dea, G.D., Ogin, Greg H., Oh, John J., Oh, Sanghoon H., Ohme, Frank, Okada, Marcos A., Oliver, Miquel, Oppermann, Patrick, Oram, Richard J., O'Reilly, B., Ormiston, Rich, Ortega, Luis F., O'Shaughnessy, R., Ossokine, Serguei, Ottaway, David J., Overmier, Harry, Owen, Ben J., Pace, Alexander E., Page, Jessica, Page, Michael A., Pai, Archana, Pai, Siddhesh A., Palamos, Jordan R., Palashov, Oleg, Palomba, Cristiano, Pal-Singh, A., Pan, Howard, Pan, Huang-Wei, Pang, Belinda, Pang, P.T.H., Pankow, Chris, Pannarale, Francesco, Pant, Brijesh C., Paoletti, Federico, PAOLI, Andrea, Papa, Maria A., Parida, Abhishek, Parker, William, Pascucci, Daniela, Pasqualetti, Antonio, Passaquieti, Roberto, Passuello, Diego, Patil, M., Patricelli, Barbara, Pearlstone, Brynley L., Pedraza, Mike, Pedurand, Richard, Pekowsky, L., Pele, Arnaud, Penn, Steven, Perez, Carlos J., Perreca, Antonio, Perri, Leah M., Pfeiffer, Harald P., Phelps, Margot, Piccinni, Ornella J., Pichot, Mikhael, Piergiovanni, Francesco, Pierro, Vincenzo, Pillant, Gabriel, Pinard, Laurent, Pinto, Innocenzo M., Pirello, Marc, Pisarski, A., Pitkin, Matthew, Poe, Mark, Poggiani, Rosa, Popolizio, Pasquale, Porter, K., Post, Alexander, Powell, Jade, Prasad, Jayanti, Pratt, James W.W., Pratten, Geraint, Predoi, Valeriu, Prestegard, Tanner, Prijatelj, Mirko, Principe, Maria, Privitera, Stephen, Prodi, Giovanni A., Prokhorov, Leonid G., Puncken, Oliver, Punturo, Michele, Puppo, Paola, Pürrer, Michael, Qi, Hong, Quetschke, Volker, Quintero, Eric A., Quitzow-James, R., Raab, Fred J., Rabeling, David S., Radkins, Hugh, Raffai, Peter, Raja, Sendhil, Rajan, C., Rajbhandari, Binod, Rakhmanov, Malik, Ramirez, Karla E., Ramos-Buades, A., Rapagnani, Piero, Raymond, Vivien, Razzano, Massimiliano, Read, Jocelyn, Regimbau, Tania, Rei, Luca, Reid, Stuart, Reitze, David H., Ren, Wei, Reyes, Steven D., Ricci, Fulvio, Ricker, Paul M., Rieger, Sascha, Riles, Keith, Rizzo, Monica, Robertson, Norna A., Robie, Raymond, Robinet, Florent, Rocchi, Alessio, ROLLAND, Loic, Rollins, Jameson G., Roma, Vincent J., Romano, Rocco, Romel, Chandra L., Romie, Janeen H., Rosińska, Dorota, Ross, Michael P., Rowan, Sheila, Rüdiger, Albrecht, Ruggi, Paolo, Rutins, Guntis, Ryan, Kyle, Sachdev, Surabhi, Sadecki, Travis, Sadeghian, Laleh, Sakellariadou, Mairi, Salconi, Livio, Saleem, Muhammed, Salemi, Francesco, Samajdar, Anuradha, Sammut, Letizia, Sampson, Laura M., Sanchez, Eduardo J., Sanchez, Luis E., Sanchis-Gual, N., Sandberg, Vernon, Sanders, Jaclyn R., Sassolas, Benoit, Saulson, Peter R., Sauter, Orion, Savage, Richard L., Sawadsky, Andreas, Schale, Paul, Scheel, Mark, Scheuer, Jacob, Schmidt, Justus, Schmidt, Patricia, Schnabel, Roman, Schofield, Robert M.S., Schönbeck, Axel, Schreiber, Emil, Schuette, Dirk, Schulte, Bernd W., Schutz, Bernard F., Schwalbe, Sophia G., Scott, Jamie, Scott, Susan M., Seidel, E., Sellers, Danny, Sengupta, Anand S., Sentenac, Daniel, Sequino, Valeria, Sergeev, Alexander, Shaddock, Daniel A., Shaffer, Thomas J., Shah, Ankur A., Shahriar, M.S., Shaner, Morgan B., Shao, Lijing, Shapiro, Brett, Shawhan, Peter, Sheperd, Alec, Shoemaker, David H., Shoemaker, Deirdre M., Siellez, Karelle, Siemens, Xavier, Sieniawska, Magdalena, Sigg, Daniel, Silva, Allan D., Singer, Leo P., Singh, Avneet, Singhal, Akshat, Sintes, Alicia M., Slagmolen, Bram J.J., Smith, Bryan, Smith, Joshua R., Smith, Rory J.E., Somala, Surendranadh, Son, Edwin J., Sonnenberg, Jacob A., Sorazu, Borja, Sorrentino, Fiodor, Souradeep, Tarun, Spencer, Andrew P., Srivastava, Amit K., Staats, Kai, Staley, Alexan, Steinke, Michael, Steinlechner, Jessica, Steinlechner, Sebastian, Steinmeyer, Daniel, Stevenson, Simon P., Stone, Robert, Stops, David J., Strain, Ken A., Stratta, Giulia, Strigin, Sergey E., Strunk, A., Sturani, Riccardo, Stuver, Amber L., Summerscales, Tiffany Z., Sun, Ling, Sunil, S., Suresh, Jishnu, Sutton, Patrick J., Swinkels, Bas L., Szczepańczyk, Marek J., Tacca, Matteo, Tait, Simon C., Talbot, Colm, Talukder, Dipongkar, Tanner, David B., Tao, Duo, Tápai, Marton, Taracchini, Andrea, Tasson, Jay D., Taylor, Jordan A., Taylor, Robert, Tewari, Shivam V., Theeg, Thomas, Thies, Fabian, Thomas, E.G., Thomas, Michael, Thomas, Patrick, Thorne, Keith A., Thrane, Eric, Tiwari, Shubhanshu, Tiwari, Vaibhav, Tokmakov, Kirill V., Toland, Karl, Tonelli, Mauro, Tornasi, Zeno, Torres-Forné, A., Torrie, Calum I., Töyrä, Daniel, Travasso, Flavio, Traylor, Gary, Trinastic, Jonathan, Tringali, Maria C., Trozzo, Lucia, Tsang, K.W., Tse, Maggie, Tso, Rhondale, Tsukada, Leo, Tsuna, Daichi, Tuyenbayev, Darkhan, Ueno, Koh, Ugolini, Dennis, Unnikrishnan, Cs S., Urban, Alexander L., Usman, Samantha A., Vahlbruch, Henning, Vajente, Gabriele, Valdes, Guillermo, Van Bakel, N., van Beuzekom, Martin, Van Den Brand, J.F.J., Van Den Broeck, C., Vander-Hyde, D.C., van der Schaaf, L., van Heijningen, J.V., van Veggel, A.A., Vardaro, Marco, Varma, Vijay, Vass, Steve, Vasúth, Matyas, Vecchio, Alberto, Vedovato, Gabriele, Veitch, John, Veitch, Peter J., Venkateswara, Krishna, Venugopalan, Gautam, Verkindt, Didier, Vetrano, Flavio, Viceré, Andrea, Viets, Aaron D., Vinciguerra, Serena, Vine, David J., Vinet, J.-Y., Vitale, Salvatore, Vo, Thomas, Vocca, Helios, Vorvick, Cheryl, Vyatchanin, Sergey P., Wade, Andrew R., Wade, Leslie E., Wade, Madeline, Walet, Rob, Walker, Marissa, Wallace, Larry, Walsh, Sinead, Wang, Gang, Wang, Haoyu, Wang, Jonathan Z., Wang, Wenhui H., Wang, Yifan F., Ward, Robert L., Warner, Jim, Was, Michal, Watchi, Jennifer, Weaver, Betsy, Wei, L.-W., Weinert, Michael, Weinstein, Alan J., Weiss, Rainer, Wen, Linqing, Wessel, Erik K., Weßels, Peter, Westerweck, Julian, Westphal, Tobias, Wette, Karl, Whelan, John T., Whiting, Bernard F., Whittle, Chris, Wilken, D., Williams, Daniel, Williams, Roy D., Williamson, Andrew R., Willis, Joshua L., Willke, Benno, Wimmer, Maximilian H., Winkler, Walter, Wipf, Christopher C., Wittel, Holger, Woan, Graham, Woehler, Janis, Wofford, Jared, Wong, W.K., Worden, John, Wright, Jennifer L., Wu, David S., Wysocki, Daniel M., Xiao, Sophia, Yamamoto, Hiro, Yancey, Cregg C., Yang, Le, Yap, M.J., Yazback, Maher, Yu, Hang, Yu, Haocun, Yvert, Michel, Zadrożny, Adam, Zanolin, Michele, Zelenova, Tatiana, Zendri, J.-P., Zevin, Michael, Zhang, Liyuan, Zhang, Mi, Zhang, Teng, Zhang, Y.-H., Zhao, Chunnong, Zhou, Minchuan, Zhou, Zifan, Zhu, Sylvia J., Zhu, Xingjiang J., Zucker, Michael E., and Zweizig, J.
Abstract: We report on a new all-sky search for periodic gravitational waves in the frequency band 475-2000 Hz and with a frequency time derivative in the range of [-1.0,+0.1]×10-8 Hz/s. Potential signals could be produced by a nearby spinning and slightly nonaxisymmetric isolated neutron star in our Galaxy. This search uses the data from Advanced LIGO's first observational run O1. No gravitational-wave signals were observed, and upper limits were placed on their strengths. For completeness, results from the separately published low-frequency search 20-475 Hz are included as well. Our lowest upper limit on worst-case (linearly polarized) strain amplitude h0 is ∼4×10-25 near 170 Hz, while at the high end of our frequency range, we achieve a worst-case upper limit of 1.3×10-24. For a circularly polarized source (most favorable orientation), the smallest upper limit obtained is ∼1.5×10-25. © 2018 American Physical Society.
Published: 2018

36. Gas flow through the piston ring pack

Author: Veigend, Petr, primary, Necasov, Gabriela, additional, Raffai, Peter, additional, Åtek, Vclav, additional, and Kunovsk, Jir, additional
Published: 2018
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37. Effective computational model for a solution of turbocharger rotor dynamics

Author: Novotny, Pavel, Dlugoš, Jozef, Prokop, Aleš, Řehák, Kamil, Raffai, Peter, Novotny, Pavel, Dlugoš, Jozef, Prokop, Aleš, Řehák, Kamil, and Raffai, Peter
Abstract: The article describes the development and a subsequent application of a computational model for effective and fast simulations of the turbocharger rotordynamics in time domains. The simulation tool consists of two basic models which are described in the article. The rotor is modelled as a flexible structure based on the nonlinear beam approach suitable for an effective solution in the time domain. The computational model also incorporates radial and axial bearing models. Theoretical background of the inovative journal bearing computational models, based on the numerical solution of the Reynolds equation, is presented. The capabilities of the simulation and sample results are demonstrated on a middle size turbocharger rotor supported by fully floating ring bearings.
Published: 2017

38. Parameter Estimation for Gravitational-wave Bursts with the BayesWave Pipeline

Author: Massachusetts Institute of Technology. Department of Physics, MIT Kavli Institute for Astrophysics and Space Research, Essick, Reed Clasey, Katsavounidis, Erotokritos, Vitale, Salvatore, Bécsy, Bence, Raffai, Peter, Cornish, Neil J., Kanner, Jonah, Littenberg, Tyson B., Millhouse, Margaret, Massachusetts Institute of Technology. Department of Physics, MIT Kavli Institute for Astrophysics and Space Research, Essick, Reed Clasey, Katsavounidis, Erotokritos, Vitale, Salvatore, Bécsy, Bence, Raffai, Peter, Cornish, Neil J., Kanner, Jonah, Littenberg, Tyson B., and Millhouse, Margaret
Abstract: We provide a comprehensive multi-aspect study of the performance of a pipeline used by the LIGO-Virgo Collaboration for estimating parameters of gravitational-wave bursts. We add simulated signals with four different morphologies (sine-Gaussians (SGs), Gaussians, white-noise bursts, and binary black hole signals) to simulated noise samples representing noise of the two Advanced LIGO detectors during their first observing run. We recover them with the BayesWave (BW) pipeline to study its accuracy in sky localization, waveform reconstruction, and estimation of model-independent waveform parameters. BW localizes sources with a level of accuracy comparable for all four morphologies, with the median separation of actual and estimated sky locations ranging from 25.°1 to 30.°3. This is a reasonable accuracy in the two-detector case, and is comparable to accuracies of other localization methods studied previously. As BW reconstructs generic transient signals with SG wavelets, it is unsurprising that BW performs best in reconstructing SG and Gaussian waveforms. The BW accuracy in waveform reconstruction increases steeply with the network signal-to-noise ratio (S/N), reaching a 85% and 95% match between the reconstructed and actual waveform below S/N and S/N, respectively, for all morphologies. The BW accuracy in estimating central moments of waveforms is only limited by statistical errors in the frequency domain, and is also affected by systematic errors in the time domain as BW cannot reconstruct low-amplitude parts of signals that are overwhelmed by noise. The figures of merit we introduce can be used in future characterizations of parameter estimation pipelines.
Published: 2017

39. Parameter Estimation for Gravitational-wave Bursts with the BayesWave Pipeline

Author: Bécsy, Bence, primary, Raffai, Peter, additional, Cornish, Neil J., additional, Essick, Reed, additional, Kanner, Jonah, additional, Katsavounidis, Erik, additional, Littenberg, Tyson B., additional, Millhouse, Margaret, additional, and Vitale, Salvatore, additional
Published: 2017
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40. Effective computational model for a solution of turbocharger rotor dynamics

Author: Novotny, Pavel, primary, Dlugoš, Jozef, additional, Prokop, Aleš, additional, Řehák, Kamil, additional, and Raffai, Peter, additional
Published: 2017
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41. Influence of Turbine and Compressor Wheel Mass and Inertia on the Rotor Dynamics of Turbocharger

Author: Knotek, Jiří, Novotný, Pavel, Maršálek, Ondřej, Raffai, Peter, Dlugoš, Jozef, Knotek, Jiří, Novotný, Pavel, Maršálek, Ondřej, Raffai, Peter, and Dlugoš, Jozef
Abstract: This paper describes the influence of the compressor and turbine wheel mass and inertia change on the turbocharger rotor dynamics. The model of the turbocharger is presented, the hydrodynamic model of the journal bearing is described and assembly of the whole model in MBS is also presented. The article presents various results describing rotor dynamics on which the influence of compressor and turbine wheel mass and inertia change is discussed., Tento článek popisuje vliv hmotnosti a momentu setrvačnosti kompresorového a turbínového kola na dynamiku rotoru turbodmychadla. V článku je představen model turbodmychadla, hydrodynamický model kluzného ložiska a také je popsáno sestavení celého modelu v prostředí MBS. V článku jsou uvedeny různé výsledky popisující dynamika rotoru, na kterém se diskutuje vliv změny hmotnosti a momentu setrvačnosti kompresorového a turbínového kola.
Published: 2016

42. Difficulties in Computational Modelling of Piston/Liner Interaction

Author: Dlugoš, Jozef, Novotný, Pavel, Raffai, Peter, Dlugoš, Jozef, Novotný, Pavel, and Raffai, Peter
Abstract: From the very beginning of the piston dynamic behavior investigation, the engineers tended to use experimental methods and compare them with very simple calculations. However, the experimental tests did show some serious difficulties that needed to be managed in order to obtain reasonable results, e.g. separation of vibrations due to piston slap motion, signal destroyed by combustion process, etc. This is the reason why the test rigs were hardly able to provide detailed insights into the piston dynamics, since it could be lost in a plethora of interactive physical phenomena. Therefore, the focus was, gradually, aimed at the computational models, which were (and still are) much faster, but need to be compared with experimental results to ensure the adequacy of algorithms used. This paper discusses the difficulties and uncertainties occurring during the construction of such computational model., Od začiatku vyšetrovania dynamického správania piestu sa inžinieri uchyľovali k experimentálnym metódam a porovnávali ich s veľmi jednoduchými výpočtami. Výsledky experimentov vykazovali niekoľko závažných problémov, ktoré museli byť vyriešené za účelom získania rozumných výsledkov ako napr. separácia vibrácií spôsobených klopením piesta, signál znehodnotený spaľovacím procesom a iné. To je dôvod prečo testovacie zariadenia len ťažko dokázali ponúknuť náhľad do detailov dynamického chovania piestu, pretože sa mohli stratiť v množstve doprovodných fyzikálnych dejov. Preto bola pozornosť postupne zameriavaná na výpočtové modely, ktoré boli (a stále sú) omnoho rýchlejšie, ale vyžadujú porovnávanie s experimentálnymi výsledkami kvôli posúdeniu vhodnosti použitých algoritmov. Tento príspevok sa zaoberá problémami a neistotami, ktoré sa objavujú pri vývoji takého výpočtového modelu.
Published: 2016

43. Computational simulation of the turbocharger rotor mechanical noise

Author: Novotny, Pavel, Dlugos, Jozef, Raffai, Peter, Novotny, Pavel, Dlugos, Jozef, and Raffai, Peter
Abstract: The article describes the computational model of turbocharger rotor including slide bearings and a subsequent application of multibody software for simulation of the turbocharger rotordynamics. The new developed simulation tool is based on the software enabling simulations of multibody nonlinear transient dynamics. The rotor is modelled as a flexible structure based on the Timoshenko’s beam nonlinear theory suitable for an effective solution in the time domain. The computational model incorporates journal and axial slide bearing models. Theoretical background of the journal bearing computational models, based on the numerical solution of the Reynolds equation, is presented. The simulation capabilities and possible results are demonstrated on the tractor diesel engine turbocharger rotor supported by fully floating ring bearings.
Published: 2016

44. Advanced Computational Analysis of Connecting Rod of an Aircraft Engine

Author: Dlugoš, Jozef, primary, Novotný, Pavel, additional, and Raffai, Peter, additional
Published: 2016
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45. Computer Simulation of the Behavior of the Piston Ring Pack of Internal Combustion Engines

Author: Raffai, Peter, primary, Novotný, Pavel, additional, and Dlugoš, Jozef, additional
Published: 2016
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46. Multimessenger science reach and analysis method for common sources of gravitational waves and high-energy neutrinos

Author: Baret, Bruny, Bartos, Imre, Bouhou, Boutayeb, Chassande-Mottin, Eric, Corsi, Alessandra, Di Palma, Irene, Donzaud, Corinne, Drago, Marco, Finley, Chad, Jones, Gareth, Klimenko, Sergey, Kouchner, Antoine, Marka, Szabolcs, Marka, Zsuzsa, Moscoso, Luciano, Papa, Maria Alessandra, Pradier, Thierry, Prodi, Giovanni, Raffai, Peter, Re, Virginia, Rollins, Jameson, Salemi, Francesco, Sutton, Patrick, Tse, Maggie, Van Elewyck, Veronique, Vedovato, Gabriele, Baret, Bruny, Bartos, Imre, Bouhou, Boutayeb, Chassande-Mottin, Eric, Corsi, Alessandra, Di Palma, Irene, Donzaud, Corinne, Drago, Marco, Finley, Chad, Jones, Gareth, Klimenko, Sergey, Kouchner, Antoine, Marka, Szabolcs, Marka, Zsuzsa, Moscoso, Luciano, Papa, Maria Alessandra, Pradier, Thierry, Prodi, Giovanni, Raffai, Peter, Re, Virginia, Rollins, Jameson, Salemi, Francesco, Sutton, Patrick, Tse, Maggie, Van Elewyck, Veronique, and Vedovato, Gabriele
Abstract: We present the baseline multimessenger analysis method for the joint observations of gravitational waves (GW) and high-energy neutrinos (HEN), together with a detailed analysis of the expected science reach of the joint search. The analysis method combines data from GW and HEN detectors, and uses the blue-luminosity-weighted distribution of galaxies. We derive expected GW + HEN source rate upper limits for a wide range of source parameters covering several emission models. Using published sensitivities of externally triggered searches, we derive joint upper limit estimates both for the ongoing analysis with the initial LIGO-Virgo GW detectors with the partial IceCube detector (22 strings) HEN detector and for projected results to advanced LIGO-Virgo detectors with the completed IceCube (86 strings). We discuss the constraints these upper limits impose on some existing GW + HEN emission models., AuthorCount:26
Published: 2012
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47. A conceptual study of a cranktrain with low friction losses

Author: Drápal, Lubomír, primary, Novotný, Pavel, additional, Maršálek, Ondřej, additional, Raffai, Peter, additional, and Píštěk, Václav, additional
Published: 2013
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48. Detecting long-duration narrow-band gravitational wave transients associated with soft gamma repeater quasiperiodic oscillations

Author: Murphy, David, primary, Tse, Maggie, additional, Raffai, Peter, additional, Bartos, Imre, additional, Khan, Rubab, additional, Márka, Zsuzsa, additional, Matone, Luca, additional, Redwine, Keith, additional, and Márka, Szabolcs, additional
Published: 2013
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49. Multimessenger science reach and analysis method for common sources of gravitational waves and high-energy neutrinos

Author: Baret, Bruny, primary, Bartos, Imre, additional, Bouhou, Boutayeb, additional, Chassande-Mottin, Eric, additional, Corsi, Alessandra, additional, Di Palma, Irene, additional, Donzaud, Corinne, additional, Drago, Marco, additional, Finley, Chad, additional, Jones, Gareth, additional, Klimenko, Sergey, additional, Kouchner, Antoine, additional, Márka, Szabolcs, additional, Márka, Zsuzsa, additional, Moscoso, Luciano, additional, Papa, Maria Alessandra, additional, Pradier, Thierry, additional, Prodi, Giovanni, additional, Raffai, Peter, additional, Re, Virginia, additional, Rollins, Jameson, additional, Salemi, Francesco, additional, Sutton, Patrick, additional, Tse, Maggie, additional, Van Elewyck, Véronique, additional, and Vedovato, Gabriele, additional
Published: 2012
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50. Bounding the time delay between high-energy neutrinos and gravitational-wave transients from gamma-ray bursts

Author: Baret, Bruny, primary, Bartos, Imre, additional, Bouhou, Boutayeb, additional, Corsi, Alessandra, additional, Palma, Irene Di, additional, Donzaud, Corinne, additional, Elewyck, Véronique Van, additional, Finley, Chad, additional, Jones, Gareth, additional, Kouchner, Antoine, additional, Márka, Szabolcs, additional, Márka, Zsuzsa, additional, Moscoso, Luciano, additional, Chassande-Mottin, Eric, additional, Papa, Maria Alessandra, additional, Pradier, Thierry, additional, Raffai, Peter, additional, Rollins, Jameson, additional, and Sutton, Patrick, additional
Published: 2011
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