Can I read Nano-Hz gravitational wave signature from axion dark matter on EtoBox?

Nano-Hz gravitational wave signature from axion dark matter by Kitajima, Naoya; Soda, Jiro; Urakawa, Yuko is a scholarly article available to read on EtoBox.

What is Nano-Hz gravitational wave signature from axion dark matter about?

We calculate the accurate spectrum of the stochastic gravitational wave background from U(1) gauge fields produced by axion dark matter. The explosive production of gauge fields soon invalidates the applicability of the linear analysis and one needs nonlinear schemes. We make use of numerical lattice simulations to properly follow the nonlinear dynamics such as backreaction and rescattering which gives important contributions to the emission of gravitational waves. It turns out that the axion with the decay constant $f \sim 10^{16}$ GeV which gives the correct dark matter abundance predicts the circularly polarized gravitational wave signature detectable by SKA. We also show that the resulting gravitational wave spectrum has a potential to explain NANOGrav 12.5 year data.

Author

Kitajima, Naoya; Soda, Jiro; Urakawa, Yuko

Published

2020

Language

EN