Sterile neutrino dark matter with dipole interaction

Abstract

We consider the possibility of the lightest sterile neutrino dark matter which has dipole interaction with heavier sterile neutrinos. The lifetime can be long enough to be a dark matter candidate without violating other constraints and the correct amount of relic abundance can be produced in the early Universe. We find that a sterile neutrino with the mass of around MeV and the dimension-five non-renormalisable dipole interaction suppressed by ${\Lambda }_5\gtrsim 10^{15}$ GeV can be a good candidate of dark matter, while heavier sterile neutrinos with masses of the order of GeV can explain the active neutrino oscillations.

arXiv comment20 pages, 6 figures

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• Probing right-handed neutrinos dipole operators
• Neutrino Portals, Terrestrial Upscattering, and Atmospheric Neutrinos
• Probing Heavy Sterile Neutrinos at Ultrahigh Energy Neutrino Telescopes via the Dipole Portal
• Generation of neutrino dark matter, baryon asymmetry, and radiation after quintessential inflation