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arXiv · 2208.10398

The radiation emitted from axion dark matter in a homogeneous magnetic field, and possibilities for detection

Shuo Xu·Siyu Chen·Hong-Hao Zhang·Guangbo Long
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Abstract

We study the direct radiation excited by oscillating axion (or axion-like particle) dark matter in a homogenous magnetic field and its detection scheme. We concretely derive the analytical expression of the axion-induced radiated power for a cylindrical uniform magnetic field. In the long wave limit, the radiation power is proportional to the square of the B-field volume and the axion mass $m_a$, whereas it oscillate as approaching the short wave limit and the peak powers are proportional to the side area of the cylindrical magnetic field and $m_a^{-2}$. The maximum power locates at mass $m_a\sim\frac{3π}{4R}$ for fixed radius $R$. Based on this characteristic of the power, we discuss a scheme to detect the axions in the mass range $1-10^4$\,neV, where four detectors of different bandwidths surround the B-field. The expected sensitivity for $m_a\lesssim1\,μ$eV under typical-parameter values can far exceed the existing constraints.

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Shuo Xu, Siyu Chen, Hong-Hao Zhang, Guangbo Long. 2022-08-24. The radiation emitted from axion dark matter in a homogeneous magnetic field, and possibilities for detection. https://doi.org/10.1103/physrevd.106.075026

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