Listening for Echo from the Stimulated Axion Decay with the 21 CentiMeter Array
Science Bulletin(2024)
Abstract
The axion is a hypothetical elementary particle that could solve the
long-standing strong CP problem in particle physics and the dark matter mystery
in the cosmos. Due to the stimulation of the ambient photons, the axion dark
matter decay into photons is significantly enhanced so that its echo signal
could be detected by terrestrial telescopes. As a pathfinder, we study the
expected sensitivity of searching for the axion dark matter in the mass range
between 0.41 and 1.6μeV with the 21 CentiMeter Array (21CMA). We
aim to cover the whole 21CMA frequency range in two years by using a 1MW
emitter. We find that the resulting sensitivity on the axion-photon coupling
could surpass other existing limits by about one order of magnitude.
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