paper

Exploring the string axiverse and parity violation in gravity with gravitational waves

arXiv:1708.09592 · doi:10.1142/S0218271818500967

Abstract

We show that the parametric resonance of gravitational waves occurs due to the axion coherent oscillation and the circular polarization of gravitational waves is induced by the Chern-Simons coupling. However, we have never observed these signatures in the data of gravitational waves. Using this fact, we give stringent constraints on the Chern-Simons coupling constant and the abundance of the light string axion. In particular, we improved the current bound by many orders of magnitude.

5 pages, 2 figures

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