Neutrino Oscillation and Matter-antimatter Asymmetry of Universe

Abstract

I show that matter-antimatter asymmetry can be generated through the neutrino oscillation at the very beginning of the Universe. The neutrino oscillation happens due to the matter effect despite the tiny vacuum mass of the neutrino in the presence of the dimension-five term contributing to the ordinary Majorana neutrino mass. This talk is mainly based on Ref. [1]. See also the subsequent study [2,3] appeared after this talk.