Longevity Problem of Sterile Neutrino Dark Matter

Abstract

Sterile neutrino dark matter of mass O(1-10) keV decays into an active neutrino and an X-ray photon, and the non-observation of the corresponding X-ray line requires the sterile neutrino to be more long-lived than estimated based on the seesaw formula : the longevity problem. We show that, if one or more of the B-L Higgs fields are charged under a flavor symmetry (or discrete R symmetry), the split mass spectrum for the right-handed neutrinos as well as the required longevity is naturally realized. We provide several examples in which the predicted the X-ray flux is just below the current bound.

24 pages, 5 figures, v2: references added

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• Neutrinoful Universe
• 7 keV sterile neutrino dark matter from split flavor mechanism
• Anomaly-free flavor models for Nambu-Goldstone bosons and the 3.5 keV X-ray line signal
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