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 {omega ^{2}=k^{2}}{pm 2zeta 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., zeta =0.14^{+0.22}_{-0.31}times 10^{-15},text {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.
Highlights
IntroductionThe discovery of binary black hole(BBH) coalescences by the Laser Interferometer Gravitational-Wave Observatory (LIGO) [12] opens a clean observational window to provide strict tests of fundamental physics [13,14,15,16,17,18,19,20,21,22]
CPT invariance is a fundamental law in nature, it is well justified to be unstinting in one’s efforts to explore CPT violation under various circumstances.The discovery of binary black hole(BBH) coalescences by the Laser Interferometer Gravitational-Wave Observatory (LIGO) [12] opens a clean observational window to provide strict tests of fundamental physics [13,14,15,16,17,18,19,20,21,22]
We consider a compilation of ten signals of BBH coalescences which were reported in the LIGO-Virgo catalog GWTC-1 [36]
Summary
The discovery of binary black hole(BBH) coalescences by the Laser Interferometer Gravitational-Wave Observatory (LIGO) [12] opens a clean observational window to provide strict tests of fundamental physics [13,14,15,16,17,18,19,20,21,22]. We perform such a test of CPT invariance in gravitational waves (GWs). We can perform measurements of the polarizations to test CPT invariance in GWs or detect possible deviations from it
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