Longevity problem of sterile neutrino dark matter

Hiroyuki Ishida, Kwang Sik Jeong, Fuminobu Takahashi

Research output: Contribution to journalArticlepeer-review

12 Citations (Scopus)


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 realized. We provide several examples in which the predicted X-ray flux is just below the current bound.

Original languageEnglish
Pages (from-to)242-247
Number of pages6
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Publication statusPublished - 2014 Apr 4


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