부산대학교 도서관

We show that a sterile neutrino with mass in the 1-20 keV range and a smallmixing with the electron neutrino can simultaneously explain the origin of thepulsar motions and the dark matter in the universe. An asymmetric neutrinoemission from a hot nascent neutron star can be the explanation of the observedpulsar velocities. In addition to the pulsar kick mechanism based on resonantneutrino transitions, we point out a new possibility: an asymmetricoff-resonant emission of sterile neutrinos. The two cases correspond todifferent values of the masses and mixing angles. In both cases we identify theranges of parameters consistent with the pulsar kick, as well as cosmologicalconstraints.