paper

Search for anisotropic, birefringent spacetime-symmetry breaking in gravitational wave propagation from GWTC-3

arXiv:2210.04481 · doi:10.1103/PhysRevD.107.064031

Abstract

An effective field theory framework, the Standard-Model Extension, is used to investigate the existence of Lorentz and CPT-violating effects during gravitational wave propagation. We implement a modified equation for the dispersion of gravitational waves, that includes isotropic, anisotropic and birefringent dispersion. Using the LIGO-Virgo-KAGRA algorithm library suite, we perform a joint Bayesian inference of the source parameters and coefficients for spacetime symmetry breaking. From a sample of 45 high confidence events selected in the GWTC-3 catalog, we obtain a maximal bound of ~m at 90\% CI for the isotropic coefficient when assuming the anisotropic coefficients to be zero. The combined measurement of all the dispersion parameters yields limits on the order of ~m for the 16 coefficients. We study the robustness of our inference by comparing the constraints obtained with different waveform models, and find that a lack of physics in the simulated waveform may appear as spacetime symmetry breaking-induced dispersion for a subset of events.

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