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

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.

9 pages, 1 figure; discussion on BICEP2 result and references added, typos corrected; published in PLB

References in corpus (4)

• The velocity function in the local environment from LCDM and LWDM constrained simulations
• The inner structure of haloes in Cold+Warm dark matter models
• Axinos as Dark Matter Particles
• Axino dark matter with R-parity violation and 130 GeV gamma-ray line

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