Detecting Ultra-light Dark Matter with Stimulated Annihilation

Author:

Yuanlin Gong, Xin Liu, Lei Wu, Qiaoli Yang, Bin Zhu

Keyword:

High Energy Physics - Phenomenology, High Energy Physics - Phenomenology (hep-ph), Cosmology and Nongalactic Astrophysics (astro-ph.CO)

journal:

date:

2023-08-15 16:00:00

Abstract

Ultra-light Dark Matter (ULDM) is one of the most promising DM candidates. We find that the annihilation rate of the ULDM in the presence of background photon radiation can be greatly enhanced due to the Bose enhancement. We propose to utilize such stimulated annihilation to probe the ULDM. By emitting a beam of radio into space, we can have a distinctive reflected electromagnetic wave with an angular frequency equal to the ULDM mass. We show that low-frequency radio telescopes, such as LOFAR, UTR-2 and ngLOBO, can offer a new avenue for detecting this signal, especially for the local DM halo model near the Earth. With a power of 50 MW emitter, the expected limits could be several orders of magnitude stronger than that from Big Bang nucleosynthesis (BBN) in the ULDM mass $m_\phi$ range, $2.07 \times 10^{-8}\mathrm{~eV} \sim 4.5 \times 10^{-8}\mathrm{~eV}$.

PDF: Detecting Ultra-light Dark Matter with Stimulated Annihilation.pdf