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arXiv · 2507.01294

A Gaussian process framework for testing general relativity with gravitational waves

Lachlan Passenger·Shun Yin Cheung·Nir Guttman·Nikhil Kannachel·Paul D. Lasky·Eric Thrane
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Abstract

Gravitational-wave astronomy provides a promising avenue for the discovery of new physics beyond general relativity as it probes extreme curvature and ultra-relativistic dynamics. However, in the absence of a compelling alternative to general relativity, it is difficult to carry out an analysis that allows for a wide range of deviations. To that end, we introduce a Gaussian process framework to search for deviations from general relativity in gravitational-wave signals from binary black hole mergers with minimal assumptions. We employ a kernel that enforces our prior beliefs that - if gravitational waveforms deviate from the predictions of general relativity - the deviation is likely to be localised in time near the merger with some characteristic frequency. We demonstrate this formalism with simulated data and apply it to events from Gravitational-Wave Transient Catalog 3. We find no evidence for a deviation from general relativity. We limit the fractional deviation in gravitational-wave strain to as low as 7% (90% credibility) of the strain of GW190701_203306.

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Lachlan Passenger, Shun Yin Cheung, Nir Guttman, Nikhil Kannachel, Paul D. Lasky, Eric Thrane. 2025-07-02. A Gaussian process framework for testing general relativity with gravitational waves. https://doi.org/10.3847/1538-4357%2Fae13b0

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