2025/07/28 by Hong, Deog Ki, Im, Sang Hui, Kim, Jinsu +2
#FOS: Physical sciences #High Energy Physics - Experiment (hep-ex) #High Energy Physics - Phenomenology (hep-ph)
paper · doi:10.48550/arxiv.2507.20830
Axion dark matter induces electromagnetic radiation in conductors through nearly perpetual oscillations of electrons, driven by axion-electron interactions through the so-called chiral magnetic effect. It therefore provides a complementary probe of the axion-electron coupling gae beyond the conventional axion-photon coupling ga γ in cavities. We show that existing axion cavity experiments can constrain the coupling to gae\lesssim 10-5 over the scanned axion mass ranges, 1 μ \rm eV\lesssim ma\lesssim 20 μ \rm eV. Although we find that the radiation due to gae at the copper cavity surface of electric conductivity σ is suppressed by ma2/σ2∼ 10-20, compared to the radiation inside the cavity by the axion-photon conversion due to gaγ, a sensitivity of about 10-9 could be achieved for gae over a wider range of ma, including values higher than those previously probed, if copper walls are replaced with carbon-based conductors.