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

Physics Letters B 733, 217 (2014)

Jong-Chul Park*, Kyoungchul Kong*, Seong Chan Park 
* KU Physics and Astronomy Authors

ABSTRACT

Recently a weak X-ray emission around Eγ = 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 2Eγ 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.

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Authors: 
Jong-Chul Park, Kyoungchul Kong, Seong Chan Park