Lepton asymmetries from neutrino oscillations

Abstract

Reasonably large relic neutrino asymmetries can be generated by active-sterile neutrino oscillations. After briefly discussing possible applications, I describe the Quantum Kinetic Equation formalism used to compute the asymmetry growth curves. I then show how the basic features of these curves can be understood on the basis of the adiabatic limit approximation in the collision dominated epoch, and the pure MSW effect at lower temperatures.

7 pages, 3 embedded figures, uses espcrc2.sty. Invited talk at Neutrino 2000 (to appear in the Proceedings)

References in corpus (7)

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• Neutrino oscillations in the early universe: How large lepton asymmetry can be generated?
• Pseudo-Dirac Neutrinos
• The ${\nu }_{\mu }\leftrightarrow {\nu }_s$ interpretation of the atmospheric neutrino data and cosmological constraints
• On chaoticity of the amplification of the neutrino asymmetry in the early universe
• Amplification of Isocurvature Perturbations induced by Active-Sterile Neutrino Oscillations
• Physical origin of "chaoticity" of neutrino asymmetry