Refraction and oscillations of neutrinos in the early universe

Details Refraction and oscillations of neutrinos in the early universe Refraction and oscillations of neutrinos in the early universe

Feb 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991nuphb.349..754e&link_type=abstract

Nuclear Physics B, Volume 349, Issue 3, p. 754-790.

Physics

Nuclear Physics

103

Scientific paper

We have investigated the behaviour of the electron neutrinos νc and antineutrinos νc in the heat bath of the early Universe. We have determined the effective energies of νc and νc as functions of the temperature of the Universe. We assume that νc and νc mix with inert states νx and νinx, respectively, and consider the νc <--> νx and νc <--> νx oscillations. We have paid special attention to the adiabaticity and coherence of these transitions and have found that for a large region of the parameter space the system will evolve through a Mikheyev-Smirnov resonance. The numerical study of the combined neutrino and antineutrino systems shows that the dynamical lepton asymmetry is driven to zero. Thus no significant νc t¯ νc asymmetry can be created. If a resonance exists, both neutrinos and antineutrinos will go through it simultaneously. A large conversion of the νc and νc populations in the early Universe into the inert states νx and νx is thus possible.

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