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Proceedings of Corfu Summer Institute 2021 "School and Workshops on Elementary Particle Physics and Gravity" — PoS(CORFU2021)
In this paper, we study the time evolution of the expectation value of Majorana neutrino with the Schrödinger picture. The operators with the definite lepton number and operators with the definite mass are related to each other by a Bogolyubov transformation. Then the vacuum with the null lepton number is also related to the vacuum for the massive operator and it is written by the superposition of the vacuum for massive field and Majorana pairs condensed states. We choose the state with adoi:10.22323/1.406.0063 fatcat:24u52ijwkrb6dibzw6hxm6fo2e