Nonequilibrium Neutrino Oscillations in the Early Universe with an Inverted Neutrino-Mass Hierarchy

Abstract

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.

9 pages in Latex with 6 figures (10 postscript files)

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• Collective three-flavor oscillations of supernova neutrinos
• Self-induced decoherence in dense neutrino gases
• High-energy neutrino conversion and the lepton asymmetry in the universe
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• Theoretical Overview of Neutrino Properties
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• Density profiles of supernova matter and determination of neutrino parameters
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