Resonance instability of primordial gravitational waves during inflation in Chern–Simons gravity

Author:

Fu ChengjieORCID,Liu Jing,Zhu Tao,Yu Hongwei,Wu Puxun

Abstract

AbstractWe investigate axion inflation where the gravitational Chern–Simons term is coupled to a periodic function of the inflaton. We find that tensor perturbations with different polarizations are amplified in different ways by the Chern–Simons coupling. Depending on the model parameters, the resonance amplification results in a parity-violating peak or a board plateau in the energy spectrum of gravitational waves, and the sharp cutoff in the infrared region constitutes a characteristic distinguishable from stochastic gravitational wave backgrounds produced by matter fields in Einstein gravity.

Funder

National Key Research and Development Program of China

National Natural Science Foundation of China

Science and Technology Innovation Plan of Hunan province

Fundamental Research Funds for the Provincial Universities of Zhejiang in China

Zhejiang Provincial Natural Science Foundation of China

Publisher

Springer Science and Business Media LLC

Subject

Physics and Astronomy (miscellaneous),Engineering (miscellaneous)

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