Generation of gravitational waves in dynamical Chern-Simons gravity
General Relativity and Quantum Cosmology
2023-01-11 v1 Cosmology and Nongalactic Astrophysics
Abstract
We investigate gravitational waves (GWs) generated in a two-field inflationary model with a non-canonical kinetic term, in which the gravitational Chern-Simons term is coupled to a heavy dynamical field. In such a model, primordial GWs experience a period of resonant amplification for some modes. In addition, isocurvature perturbations suffer from a temporary tachyonic instability due to an effective negative mass, which source curvature perturbations, resulting in large induced GWs. These two stochastic gravitational wave backgrounds correspond to different frequency bands, which are expected to be detected by future GW detectors such as SKA, LISA and Taiji.
Cite
@article{arxiv.2209.10374,
title = {Generation of gravitational waves in dynamical Chern-Simons gravity},
author = {Zhi-Zhang Peng and Zhen-Min Zeng and Chengjie Fu and Zong-Kuan Guo},
journal= {arXiv preprint arXiv:2209.10374},
year = {2023}
}