Chiral gravitational waves from domain walls in Nieh-Yan gravity
Phys. Rev. D 113, 064044 – Published 24 March, 2026
DOI: https://doi.org/10.1103/mzd4-jhr4
Abstract
We study the scattering of gravitational waves by axion domain walls in teleparallel gravity with the Nieh-Yan term. Since a domain wall causes the parity violation, the transmitted gravitational waves also exhibit the parity violation. We calculate the degree of circular polarization of gravitational waves. It turns out that gravitational waves could be chiral after going through the domain wall. The degree of circular polarization does not depend on the tension of the domain wall.
