Scalar induced gravitational waves from Chern-Simons gravity during inflation era
Abstract
We investigate the scalar induced gravitational waves (SIGWs) in the Chern-Simons (CS) gravity with a dynamical scalar field during slow roll inflation. Due to the parity violation in the CS term, the SIGWs are generally polarized, which are effectively characterized by the degree of circular polarization. We derive the semianalytic expression to evaluate the power spectra and the degree of circular polarization of the SIGWs, which receive contributions from the general relativity and the parity-violating term, respectively. We find that the correction from the parity-violating CS term is negligible on large scales, which means that the degree of circular polarization of SIGWs is very small.
Keywords
Cite
@article{arxiv.2302.00950,
title = {Scalar induced gravitational waves from Chern-Simons gravity during inflation era},
author = {Jia-Xi Feng and Fengge Zhang and Xian Gao},
journal= {arXiv preprint arXiv:2302.00950},
year = {2023}
}
Comments
23 pages, references added, and a new discussion about a linear coupling function added. Version to be published in JCAP