Nonequilibrium neutrino oscillations in the early Universe with an inverted neutrino-mass hierarchy

V.Alan Kostelecký, Stuart Samuel
1996 Physics Letters B  
The annihilation of electron-positron pairs around one second after the big bang distorts the Fermi-Dirac spectrum of neutrino energies. We determine the distortions assuming neutrino mixing with an inverted neutrino-mass hierarchy. Nonequilibrium thermodynamics, the Boltzmann equation, and numerical integration are used to achieve the results. The various types of neutrino behavior are established as a function of masses and mixing angles.
doi:10.1016/0370-2693(96)00856-8 fatcat:eodyikt5xfd37nxaf3amq323ty