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X-ray line signal from decaying axino warm dark matter

Published 7 Mar 2014 in hep-ph and astro-ph.HE | (1403.1782v2)

Abstract: We consider axino warm dark matter in a supersymmetric axion model with R-parity violation. In this scenario, axino with the mass $m_\axino\simeq 7$ keV can decay into photon and neutrino resulting in the X-ray line signal at $3.5$ keV, which might be the origin of unidentified X-ray emissions from galaxy clusters and Andromeda galaxy detected by the XMM-Newton X-ray observatory.

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