https://doi.org/10.1140/epjc/s10052-020-08628-x
Regular Article – Theoretical Physics
Tests of CPT invariance in gravitational waves with LIGO-Virgo catalog GWTC-1
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
Received:
25
August
2020
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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