A search for extra polarisations using a Gaussian process in Gravitational-Wave Transient Catalogue 3
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| Main Authors: | , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866911036275163136 |
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| author | Cheung, Shun Yin Passenger, Lachlan Lasky, Paul D. Thrane, Eric |
| author_facet | Cheung, Shun Yin Passenger, Lachlan Lasky, Paul D. Thrane, Eric |
| contents | General relativity predicts that gravitational waves are described by two polarisation states: the plus $+$ state and cross $\times$ state. However, alternate theories of gravity allow up to six polarisations. We employ the gravitational-wave null stream, a linear combination of three or more detectors where the $+$ and $\times$ signals add to zero, leaving behind noise and potentially gravitational waves in non-standard polarisation states. We develop a Gaussian process model to search for extra polarisations beyond general relativity. Using data from 42 three-detector events from LIGO-Virgo-KAGRA's Third Gravitational-Wave Transient Catalogue, we find no evidence of non-standard polarisations. We set upper limits on the fractional deviation in gravitational-wave strain to be as low as 0.39 at 90% credibility for the event GW190602_175927. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2507_02335 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | A search for extra polarisations using a Gaussian process in Gravitational-Wave Transient Catalogue 3 Cheung, Shun Yin Passenger, Lachlan Lasky, Paul D. Thrane, Eric General Relativity and Quantum Cosmology High Energy Astrophysical Phenomena General relativity predicts that gravitational waves are described by two polarisation states: the plus $+$ state and cross $\times$ state. However, alternate theories of gravity allow up to six polarisations. We employ the gravitational-wave null stream, a linear combination of three or more detectors where the $+$ and $\times$ signals add to zero, leaving behind noise and potentially gravitational waves in non-standard polarisation states. We develop a Gaussian process model to search for extra polarisations beyond general relativity. Using data from 42 three-detector events from LIGO-Virgo-KAGRA's Third Gravitational-Wave Transient Catalogue, we find no evidence of non-standard polarisations. We set upper limits on the fractional deviation in gravitational-wave strain to be as low as 0.39 at 90% credibility for the event GW190602_175927. |
| title | A search for extra polarisations using a Gaussian process in Gravitational-Wave Transient Catalogue 3 |
| topic | General Relativity and Quantum Cosmology High Energy Astrophysical Phenomena |
| url | https://arxiv.org/abs/2507.02335 |