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Gravitational Waves in Axion Dark Matter

by 1,2,†, 3,*,† and 3,†
1
Physics Division, National Center for Theoretical Sciences, National Tsing-Hua University, Hsinchu 30013, Taiwan
2
Department of Physics, National Tsing-Hua University, Hsinchu 30013, Taiwan
3
Department of Physics, Kobe University, Kobe 657-8501, Japan
*
Author to whom correspondence should be addressed.
These authors contributed equally to this work.
Universe 2020, 6(7), 89; https://doi.org/10.3390/universe6070089
Received: 7 June 2020 / Revised: 24 June 2020 / Accepted: 24 June 2020 / Published: 29 June 2020
(This article belongs to the Section Gravitation)
Axion dark matter is interesting as it allows a natural coupling to the gravitational Chern–Simons term. In the presence of an axion background, the gravitational Chern–Simons term produces parity violating effects in the gravitational sector, in particular on the propagation of gravitational waves. Previously, it has been shown that the coherent oscillation of the axion field leads to a parametric amplification of gravitational waves with a specific frequency. In this paper, we focus on the parity violating effects of the Chern–Simons coupling and show the occurrence of gravitational birefringence. We also find deviation from the speed of light of the velocity of the gravitational waves. We give constraints on the axion-Chern–Simons coupling constant and the abundance of axion dark matter from the observation of GW170817 and GRB170817A. View Full-Text
Keywords: gravitational waves; axion dark matter; Chern–Simons gravity gravitational waves; axion dark matter; Chern–Simons gravity
MDPI and ACS Style

Chu, C.-S.; Soda, J.; Yoshida, D. Gravitational Waves in Axion Dark Matter. Universe 2020, 6, 89. https://doi.org/10.3390/universe6070089

AMA Style

Chu C-S, Soda J, Yoshida D. Gravitational Waves in Axion Dark Matter. Universe. 2020; 6(7):89. https://doi.org/10.3390/universe6070089

Chicago/Turabian Style

Chu, Chong-Sun, Jiro Soda, and Daiske Yoshida. 2020. "Gravitational Waves in Axion Dark Matter" Universe 6, no. 7: 89. https://doi.org/10.3390/universe6070089

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