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arXiv · 2501.03285

Modelling noise in gravitational-wave observatories with transdimensional models

Nir Guttman·Paul D. Lasky·Eric Thrane
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Abstract

Modelling noise in gravitational-wave observatories is crucial for accurately inferring the properties of gravitational-wave sources. We introduce a transdimensional Bayesian approach to characterise the noise in ground-based gravitational-wave observatories using the Bayesian inference software $\texttt{Bilby}$. The algorithm models broadband noise with a combination of power laws; narrowband features with Lorentzians; and shapelets to capture any additional features in the data. We show that our noise model provides a significantly improved fit of the LIGO and Virgo noise amplitude spectral densities compared to currently available noise fits obtained with on-source data segments. We perform astrophysical inference on well-known events in the third Gravitational-Wave Transient Catalog using our noise model and observe shifts of up to $7\%$ in the $90\%$ boundaries of credible intervals for some parameters. We discuss plans to deploy this framework systematically for gravitational-wave inference along with possible areas of improvement.

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Nir Guttman, Paul D. Lasky, Eric Thrane. 2025-01-06. Modelling noise in gravitational-wave observatories with transdimensional models. https://arxiv.org/abs/2501.03285

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