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Searching for relativistic axions in the sky

Journal Article · · Journal of Cosmology and Astroparticle Physics
 [1];  [2];  [2];  [3]
  1. Sogang University Seoul (Korea, Republic of); Univ. of Cincinnati, OH (United States)
  2. Indian Association for the Cultivation of Science, Kolkata (India)
  3. University of Cincinnati, OH (United States)

Relativistic axions produced in decays of $$\mathcal{O}$$(10-7–10-2 eV) dark matter (DM) partially convert to photons after traversing the galactic magnetic field, giving rise to a signal observable by the Square Kilometer Array (SKA) radio telescope. In this work, we show that for axions lighter than a few × 10-13 eV a 100 h SKA observation of the local dwarf galaxy Seg I would probe parameter space not constrained by stellar cooling and cosmological observations, with sensitivity several orders of magnitude better than the planned dedicated axion dark matter search experiments. We quantify the uncertainties in the SKA sensitivity projections due to two effects that enhance the radio flux: the presence of turbulent magnetic fields inside the galaxy, and the Bose enhancement of the DM decays to axions, where the latter, in particular, warrants further study.

Research Organization:
University of Cincinnati, OH (United States)
Sponsoring Organization:
USDOE Office of Science (SC); National Research Foundation of Korea (NRF); National Science Foundation (NSF)
Grant/Contract Number:
SC0011784
OSTI ID:
2420144
Journal Information:
Journal of Cosmology and Astroparticle Physics, Journal Name: Journal of Cosmology and Astroparticle Physics Journal Issue: 08 Vol. 2023; ISSN 1475-7516
Publisher:
Institute of Physics (IOP)Copyright Statement
Country of Publication:
United States
Language:
English

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