A stochastic gravitational-wave background is expected to emerge from the superposition of numerous gravitational-wave sources of both astrophysical and cosmological origin. A number of cosmological models can have a parity violation, resulting in the generation of circularly polarized gravitational waves. We present a method to search for parity violation in the gravitational-wave data. We first apply this method to the most recent, third, LIGO-Virgo observing run. We then investigate the constraining power of future A+LIGO-Virgo detectors, including KAGRA to the network, for a gravitational-wave background generated by early universe cosmological turbulence.
Bibliographical noteFunding Information:
It is a pleasure to thank Tina Kahniashvili and Axel Brandenburg on fruitful discussions about turbulence. We acknowledge computational resources provided by the LIGO Laboratory and supported by National Science Foundation Grants No. PHY-0757058 and No. PHY-0823459. This paper has been given LIGO DCC number LIGO-P2100076. K. M. is supported by King’s College London through a Postgraduate International Scholarship. M. S. is supported in part by the Science and Technology Facility Council (STFC), United Kingdom, under the research Grant No. ST/P000258/1. V. M. is supported by the NSF Grant No. PHY-1806630. Software packages used in this paper are matplotlib , numpy , bilby , chainconsumer .
© 2021 authors. Published by the American Physical Society.