Explanipedia

Inference with finite time series: II. The window strikes back Open

C. Talbot, S. Biscoveanu, Aaron Zimmerman, Tomasz Baka, Will M. Farr , et al. · 2025

Smooth window functions are often applied to strain data when inferring the parameters describing the astrophysical sources of gravitational-wave transients. Within the LIGO-Virgo-KAGRA collaboration, it is conventional to include a term t…

The Missing Multipole Problem: Investigating biases from model starting frequency in gravitational-wave analyses Open

Ryan Ursell, C. G. Hoy, I. W. Harry · 2025

Our ability to infer the true source properties of colliding black holes from gravitational wave observations requires not only accurate waveform models but also their correct use. A key property when evaluating time-domain models is when …

Results from an injection and recovery study involving 35 numerical relativity simulations and three waveform models Open

Sarp Akçay, C. G. Hoy, Jake Mac Uilliam · 2025

We present Bayesian inference results from an extensive injection-recovery campaign to test the validity of three state of the art quasicircular gravitational waveform models: SEOBNRv5PHM, henom, henom, the latter with the SpinTaylorT4 imp…

Use and interpretation of signal-model indistinguishability measures for gravitational-wave astronomy Open

Jonathan E. Thompson, C. G. Hoy, Edward Fauchon-Jones, Mark Hannam · 2025

The difference (“mismatch”) between two gravitational-wave signals is often used to estimate the signal-to-noise ratio (SNR) at which they will be distinguishable in a measurement or, alternatively, when the errors in a signal model will l…

Incorporation of model accuracy in gravitational wave Bayesian inference Open

C. G. Hoy, Sarp Akçay, Jake Mac Uilliam, Jonathan E. Thompson · 2025

Inferring the properties of colliding black holes from gravitational wave observations is subject to systematic errors arising from modelling uncertainties. Although the accuracy of each model can be calculated through comparison to theore…

PhenomXPNR: An improved gravitational wave model linking precessing inspirals and NR-calibrated merger-ringdown Open

Eleanor Hamilton, M. Colleoni, Jonathan E. Thompson, C. G. Hoy, Anna Heffernan , et al. · 2025

We present the frequency-domain quasi-circular precessing binary-black-hole model PhenomXPNR. This model combines the most precise available post-Newtonian description of the evolution of the precession dynamics through inspiral with merge…

Waging a Campaign: Results from an Injection-Recovery Study involving 35 numerical Relativity Simulations and three Waveform Models Open

Sarp Akçay, C. G. Hoy, Jake Mac Uilliam · 2025

We present Bayesian inference results from an extensive injection-recovery campaign to test the validity of three state of the art quasicircular gravitational waveform models: \textsc{SEOBNRv5PHM}, \textsc{IMRPhenomTPHM}, \textsc{IMRPhenom…

Further constraining the neutron star-black hole merger rate Open

I. W. Harry, C. G. Hoy · 2025

Current template-based gravitational-wave searches for compact binary mergers neglect the general relativistic phenomenon of spin-induced orbital precession. Owing to their asymmetric masses, gravitational-waves from neutron star-black hol…

Premerger observation and characterization of massive black hole binaries Open

G. S. Davies, I. W. Harry, M. J. Williams, Diganta Bandopadhyay, Leor Barack , et al. · 2025

We demonstrate an end-to-end technique for observing and characterizing massive black hole binary signals before they merge with the LISA space-based gravitational-wave observatory. Our method uses a zero-latency whitening filter, original…

Rarity of precession and higher-order multipoles in gravitational waves from merging binary black holes Open

C. G. Hoy, S. Fairhurst, Ilya Mandel · 2025

The latest binary black hole population estimates argue for a subpopulation of unequal component mass binaries with spins that are likely small but isotropically distributed. This implies a nonzero probability of detecting spin-induced orb…

Premerger observation and characterization of massive black hole binaries Open

Gareth Cabourn Davies, I. W. Harry, M. J. Williams, Diganta Bandopadhyay, Leor Barack , et al. · 2024

We demonstrate an end-to-end technique for observing and characterizing massive black hole binary signals before they merge with the LISA space-based gravitational-wave observatory. Our method uses a zero-latency whitening filter, original…

A rapid multi-modal parameter estimation technique for LISA Open

C. G. Hoy, C. R. Weaving, L. K. Nuttall, I. W. Harry · 2024

The laser interferometer space antenna (LISA) will observe gravitational-wave (GW) signals from a wide range of sources, including massive black hole binaries (MBHBs). Although numerous techniques have been developed to perform Bayesian in…

Incorporation of model accuracy in gravitational wave Bayesian inference Open

C. G. Hoy, Sarp Akçay, Jake Mac Uilliam, Jonathan E. Thompson · 2024

Inferring the properties of colliding black holes from gravitational-wave observations is subject to systematic errors arising from modelling uncertainties. Although the accuracy of each model can be calculated through comparison to theore…

A rapid multi-modal parameter estimation technique for LISA Open

C. G. Hoy, C. R. Weaving, L. K. Nuttall, I. W. Harry · 2024

The Laser Interferometer Space Antenna (LISA) will observe gravitational-wave signals from a wide range of sources, including massive black hole binaries. Although numerous techniques have been developed to perform Bayesian inference for L…

Rarity of precession and higher-order multipoles in gravitational waves from merging binary black holes Open

C. G. Hoy, S. Fairhurst, Ilya Mandel · 2024

The latest binary black hole population estimates argue for a subpopulation of unequal component mass binaries with spins that are likely small but isotropically distributed. This implies a non-zero probability of detecting spin-induced or…

Revisiting the Cosmic String Origin of GW190521 Open

Josu C. Aurrekoetxea, C. G. Hoy, Mark Hannam · 2024

For the first time we analyze gravitational-wave strain data using waveforms constructed from strong gravity simulations of cosmic string loops collapsing to Schwarzschild black holes; a previously unconsidered source. Since the expected s…

<span>bilby</span> in space: Bayesian inference for transient gravitational-wave signals observed with LISA Open

C. G. Hoy, L. K. Nuttall · 2024

The Laser Interferometer Space Antenna (LISA) is scheduled to launch in the mid-2030s, and is expected to observe gravitational-wave candidates from massive black hole binary mergers, extreme mass ratio inspirals, and more. Accurately infe…

Catalog of precessing black-hole-binary numerical-relativity simulations Open

Eleanor Hamilton, Edward Fauchon-Jones, Mark Hannam, C. G. Hoy, C. V. Kalaghatgi , et al. · 2024

We present a public catalog of numerical-relativity binary-black-hole simulations. The catalog contains datasets from 80 distinct configurations of precessing binary-black-hole systems, with mass ratios up to m2/m1=8, dimensionless spin ma…

BILBY in space: Bayesian inference for transient gravitational-wave signals observed with LISA Open

C. G. Hoy, L. K. Nuttall · 2023

The Laser Interferometer Space Antenna (LISA) is scheduled to launch in the mid 2030s, and is expected to observe gravitational-wave candidates from massive black-hole binary mergers, extreme mass-ratio inspirals, and more. Accurately infe…

PhenomXO4a: a phenomenological gravitational-wave model for precessing black-hole binaries with higher multipoles and asymmetries Open

Jonathan E. Thompson, Eleanor Hamilton, L. T. London, Shrobana Ghosh, Panagiota Kolitsidou , et al. · 2023

In this work we introduce PhenomXO4a, the first phenomenological, frequency-domain gravitational waveform model to incorporate multipole asymmetries and precession angles tuned to numerical relativity. We build upon the modeling work that …

Search technique to observe precessing compact binary mergers in the advanced detector era Open

C. McIsaac, C. G. Hoy, I. W. Harry · 2023

Gravitational-wave signals from compact binary coalescences are most effectively identified by matched filter searches. These searches match the data against a pregenerated bank of gravitational-wave templates. Currently, all modeled gravi…

Revisiting the cosmic string origin of GW190521 Open

Josu C. Aurrekoetxea, C. G. Hoy, Mark Hannam · 2023

For the first time we analyse gravitational-wave strain data using waveforms constructed from strong gravity simulations of cosmic string loops collapsing to Schwarzschild black holes; a previously unconsidered source. Since the expected s…

Simple parameter estimation using observable features of gravitational-wave signals Open

S. Fairhurst, C. G. Hoy, R. Green, J. C. Mills, S. A. Usman · 2023

Using simple, intuitive arguments, we discuss the expected accuracy with which astrophysical parameters can be extracted from an observed gravitational wave signal. The observation of a chirplike signal in the data allows for measurement o…

Fast non-Markovian sampler for estimating gravitational-wave posteriors Open

V. Tiwari, C. G. Hoy, S. Fairhurst, D. M. Macleod · 2023

This article introduces varaha, an open-source, fast, non-Markovian sampler for estimating gravitational-wave posteriors. varaha differs from existing nested sampling algorithms by gradually discarding regions of low likelihood, rather tha…

Asimov: A framework for coordinating parameterestimation workflows Open

D. R. Williams, J. Veitch, Maria Luisa Chiofalo, P. Schmidt, R. P. Udall , et al. · 2023

Since the first detection in 2015 of gravitational waves from compact binary coalescence (B. P. \nAbbott & others, 2016a), improvements to the Advanced LIGO and Advanced Virgo detectors \nhave expanded our view into the universe for th…

A search technique to observe precessing compact binary mergers in the advanced detector era Open

C. McIsaac, C. G. Hoy, I. W. Harry · 2023

Gravitational-wave signals from compact binary coalescences are most efficiently identified through matched filter searches, which match the data against a pre-generated bank of gravitational-wave templates. Although different techniques f…

A catalogue of precessing black-hole-binary numerical-relativity simulations Open

Eleanor Hamilton, Edward Fauchon-Jones, Mark Hannam, C. G. Hoy, C. V. Kalaghatgi , et al. · 2023

We present a public catalogue of numerical-relativity binary-black-hole simulations. The catalogue contains datasets from 80 distinct configurations of precessing binary-black-hole systems, with mass ratios up to $m_2/m_1 = 8$, dimensionle…

VARAHA: A Fast Non-Markovian sampler for estimating Gravitational-Wave posteriors Open

V. Tiwari, C. G. Hoy, S. Fairhurst, Duncan M. Macleod · 2023

This article introduces VARAHA, an open-source, fast, non-Markovian sampler for estimating gravitational-wave posteriors. VARAHA differs from existing Nested sampling algorithms by gradually discarding regions of low likelihood, rather tha…

Precessing binary-black-hole numerical relativity catalogue (complete data release) Open

Eleanor Hamilton, Edward Fauchon-Jones, Mark Hannam, C. G. Hoy, C. V. Kalaghatgi , et al. · 2023

This page contains the minimal data release associated with the catalogue presented in A catalogue of precessing black-hole-binary numerical-relativity simulations. This catalogue contains 80 single-spin precessing black-hole-binary config…

Precessing binary-black-hole numerical relativity catalogue (complete data release) Open

Eleanor Hamilton, Edward Fauchon-Jones, Mark Hannam, C. G. Hoy, C. V. Kalaghatgi , et al. · 2023

This page contains the minimal data release associated with the catalogue presented in A catalogue of precessing black-hole-binary numerical-relativity simulations. This catalogue contains 80 single-spin precessing black-hole-binary config…

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