X-ray line signal from 7 keV axino dark matter decay

• DOI: 10.1016/j.physletb.2014.04.037
• Publication Date: 2014-04-24T15:02:19Z
• Authors: Jong-Chul Park; Kyoungchul Kong; Seong Chan Park
• Keywords: High Energy Astrophysical Phenomena (astro-ph.HE); Nuclear and High Energy Physics; Cosmology and Nongalactic Astrophysics (astro-ph.CO); keV events; FOS: Physical sciences; Astrophysics - Astrophysics of Galaxies; 01 natural sciences; BICEP2; X-ray; Axino; High Energy Physics - Phenomenology; High Energy Physics - Phenomenology (hep-ph); Astrophysics of Galaxies (astro-ph.GA); Neutrino; 0103 physical sciences; Dark matter; Astrophysics - High Energy Astrophysical Phenomena; Astrophysics - Cosmology and Nongalactic Astrophysics

Recently a weak X-ray emission around E ~ 3.5 keV was detected in the Andromeda galaxy and various galaxy clusters including the Perseus galaxy cluster but its source has been unidentified. Axino, the superpartner of axion, with a mass 2E is suggested as a possible origin of the line with R-parity violating decay into photon and neutrino. Moreover, most of parameter space is consistent with recent observation by the BICEP2 experiment.<br/>9 pages, 1 figure; discussion on BICEP2 result and references added, typos corrected; published in PLB<br/>