Regular Article – Theoretical Physics
Tests of CPT invariance in gravitational waves with LIGO-Virgo catalog GWTC-1
Theoretical Physics Division, Institute of High Energy Physics, Chinese Academy of Sciences, 100049, Beijing, People’s Republic of China
2 School of Physical Sciences, University of Chinese Academy of Sciences, 100049, Beijing, People’s Republic of China
3 Department of Astronomy, Beijing Normal University, 100875, Beijing, People’s Republic of China
Accepted: 31 October 2020
Published online: 8 November 2020
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 , where a sign 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., , 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.
© The Author(s) 2020
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