Neutrino masses, leptogenesis, and sterile neutrino dark matter

Abstract

We analyze a scenario in which the lightest heavy neutrino $N_1$ is a dark matter candidate and the second- heaviest neutrino $N_2$ decays producing a lepton number. If $N_1$ were in thermal equilibrium, its energy density today would be much larger than that of the observed dark matter, so we consider energy injection by the decay of $N_2$. In this paper, we show the parameters of this scenario that give the correct abundances of dark matter and baryonic matter and also induce the observed neutrino masses. This model can explain a possible sterile neutrino dark matter signal of $M_1$=7 keV in the x-ray observation of x-ray multi-mirror mission.

14 pages, 2 figures, v3:published version

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• 3.5 keV X-ray Line Signal from Decay of Right-Handed Neutrino due to Transition Magnetic Moment
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• A sensitive search for unknown spectral emission lines in the diffuse X-ray background with XMM-Newton
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• 7 keV sterile neutrino Dark Matter in extended seesaw framework
• Renormalization group invariant of lepton Yukawa couplings