Sterile neutrino dark matter with dipole interaction
(Sungkyunkwan University (SKKU))
I will talk about the possibility of the lightest sterile neutrino dark matter which has dipole interaction with heavier sterile neutrinos. In this model, 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 obtained. We find that a sterile neutrino with the mass of around MeV and the dimension-five non-renormalisable dipole interaction suppressed by 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.