arXiv:1403.1536·v2·High Energy Physics — Phenomenology
X-ray line signal from 7 keV axino dark matter decay
Kyoungchul Kong🇺🇸 · Jong-Chul Park · Seong Chan Park
Abstract
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.
Comments: 9 pages, 1 figure; discussion on BICEP2 result and references added, typos corrected; published in PLB