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Extra light fermions in E6-inspired models and the 3.5 keV X-ray line signal
2014
Physics Letters B
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We propose a scenario in which extra light fermions in an E_6-inspired U(1) extension of the standard model constitute the dark matter, as a simple variation of our model for dark radiation presented in 2010. Interestingly, for the light fermions of mass about 7 keV, they radiatively decay into active neutrinos and photons with a lifetime in the range of 10^27-10^28 seconds, which naturally explains the recently discovered 3.5 keV X-ray line signal.
doi:10.1016/j.physletb.2014.08.061
fatcat:v6nq5rfmznelroeagoolhzou5e