Probing cosmic axions through resonant emission and absorption in atomic systems with superradiance

Abstract

The μeV-mass axion is one of the most promising candidates for cold dark matter and remains to be a well-motivated solution to the CP problem of quantum chromodynamics (QCD) via the Peccei-Quinn mechanism. In this paper, we propose a novel method to detect the dark-matter axions in our Galaxy via the resonant emission |e.