Tests of CPT invariance in gravitational waves with LIGO-Virgo catalog GWTC-1

Sai Wang; Zhi-Chao Zhao

doi:10.1140/epjc/s10052-020-08628-x

paper

Tests of CPT invariance in gravitational waves with LIGO-Virgo catalog GWTC-1

arXiv:2002.00396 · doi:10.1140/epjc/s10052-020-08628-x

Abstract

A discovery of gravitational waves from binary black holes raises a possibility that measurements of them can provide strict tests of CPT invariance in gravitational waves. When CPT violation exists, if any, gravitational waves with different circular polarizations could gain a slight difference in propagating speeds. Hence, the birefringence of gravitational waves is induced and there should be a rotation of plus and cross modes. For CPT-violating dispersion relation $ω^{2} = k^{2}$ $\pm 2 ζ k^{3}$ , where a sign $\pm$ denotes different circular polarizations, we find no substantial deviations from CPT invariance in gravitational waves by analyzing a compilation of ten signals of binary black holes in the LIGO-Virgo catalog GWTC-1. We obtain a strict constraint on the CPT-violating parameter, i.e., $ζ = 0.1 4_{- 0.31}^{+ 0.22} \times 1 0^{- 15} m$ , which is around two orders of magnitude better than the existing one. Therefore, this study stands for the up-to-date strictest tests of CPT invariance in gravitational waves.

arXiv comment6 pages, 2 columns, 2 figures, 1 table. Moderate revision. To appear in EPJC

Tests of CPT invariance in gravitational waves with LIGO-Virgo catalog GWTC-1

Abstract

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