The use of hypermodels to understand binary neutron star collisions

Ashton, G.; Dietrich, Tim

doi:10.1038/s41550-022-01707-x

Cited by 7 publications

(3 citation statements)

References 66 publications

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“…We analyzed the 13 events with the highest mass and moderate to high SNR among the ones detected so far by Advanced LIGO and Advanced Virgo, using the "hypermodels" technique developed in Ref. [270]. This method allows us to sample directly over different waveform approximants, in order to determine which one is favored by the data.…”

Section: Discussionmentioning

confidence: 99%

“…In particular, here we employ the hypermodels approach introduced in Ref. [270], with a Metropolis-Hastings MCMC algorithm, based on the implementation of the Bilby-MCMC sampler [274].…”

Section: Bayesian Frameworkmentioning

confidence: 99%

“…For our study, we focus on the method introduced in Ref. [270], henceforth referred to as hypermodels. The purpose of our study is to obtain a quantitative measure of selection, in this case by using the odds ratio, between one waveform and another from a combination of GW events.…”

Section: Introductionmentioning

confidence: 99%

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Fundamental physics with gravitational waves

Puecher

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Since their prediction in Einstein’s theory of general relativity, gravitational waves took a hundred years to be actually detected. Nevertheless, the wait was well rewarded since measuring gravitational waves did not only provide a strong confirmation of the predictions of general relativity, but also offered a new way to study fundamental interactions. The information extracted from gravitational-wave signals allows us to probe the theory of general relativity in the strong-field regime, as well as to study the equation of state describing the extremely dense matter inside neutron stars. In this thesis, we investigated both these aspects. In particular, we developed a method to probe general relativity by looking at the amplitude of subdominant modes. On the other hand, we constructed a model that describes the gravitational-wave signal emitted during the full coalescence of a binary neutron star system, including the postmerger, and we employed it in parameter estimation analyses. We also turned our attention to next-generation detectors, which are expected to increase sensitivity and to extend the detection bandwidth both at lower and higher frequencies with respect to current detectors. We studied how this will improve our postmerger analysis, but also the measurements of the system’s parameters from the inspiral part of the signal only. In particular, for the latter, we investigated how the different designs proposed for the Einstein Telescope will affect such measurements. The high sensitivity of future detectors, however, comes also with downsides: the computational cost of the analyses will increase, thus it is necessary to find alternative techniques in order to make the analyses feasible; furthermore, the high precision with which we will be able to measure the sources’ parameters will enhance the effect of systematic errors, induced, for example, by the waveform models employed to analyze the data. For this reason, we analyzed some of the gravitational-wave events in the latest catalog with different waveform models, in order to identify possible preferences among the models and, consequently, highlight potential systematics.

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Section: Discussionmentioning

confidence: 99%

“…In particular, here we employ the hypermodels approach introduced in Ref. [270], with a Metropolis-Hastings MCMC algorithm, based on the implementation of the Bilby-MCMC sampler [274].…”

Section: Bayesian Frameworkmentioning

confidence: 99%

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Fundamental physics with gravitational waves

Puecher

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Waveform uncertainty quantification and interpretation for gravitational-wave astronomy

Read

2023

Class. Quantum Grav.

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We demonstrate how to quantify the frequency-domain amplitude and phase accuracy of waveform models, $\delta A$ and $\delta \phi$, in a form that could be marginalized over in gravitational-wave inference using techniques currently applied for quantifying calibration uncertainty. For concreteness, waveform uncertainties affecting neutron-star inspiral measurements are considered, and post-hoc error estimates from a variety of waveform models are made by comparing time-domain and frequency-domain analytic models with multiple-resolution numerical simulations. These waveform uncertainty estimates can be compared to GW170817 calibration envelopes or to Advanced LIGO and Virgo calibration goals. Signal-specific calibration and waveform uncertainties are compared to statistical fluctuations in gravitational-wave observatories, giving frequency-dependent modeling requirements for detectors such as Advanced LIGO Plus, Cosmic Explorer, or Einstein Telescope. Finally, the distribution of waveform error for the GW170817 posterior is computed from tidal models and compared to the constraints on $\delta \phi$ or $\delta A$ from GWTC-1 by Edelman et. al. In general, $\delta \phi$ and $\delta A$ can also be interpreted in terms of unmodeled astrophysical energy transfer within or from the source system.

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Accelerating multimodel Bayesian inference, model selection, and systematic studies for gravitational wave astronomy

Hoy

2022

Phys. Rev. D

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The use of hypermodels to understand binary neutron star collisions

Cited by 7 publications

References 66 publications

Fundamental physics with gravitational waves

Fundamental physics with gravitational waves

Waveform uncertainty quantification and interpretation for gravitational-wave astronomy

Accelerating multimodel Bayesian inference, model selection, and systematic studies for gravitational wave astronomy

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