Relic neutrino asymmetry evolution from first principles

Details Relic neutrino asymmetry evolution from first principles Relic neutrino asymmetry evolution from first principles

1998-09-14

arxiv.org/abs/hep-ph/9809363v3

Phys.Rev.D59:113001,1999

Physics

High Energy Physics

High Energy Physics - Phenomenology

RevTeX, 38 pages, crucial typos corrected; published version

Scientific paper

10.1103/PhysRevD.59.113001

The exact Quantum Kinetic Equations for a two-flavour active-sterile neutrino system are used to provide a systematic derivation of approximate evolution equations for the relic neutrino asymmetry. An extension of the adiabatic approximation for matter-affected neutrino oscillations is developed which incorporates decoherence due to collisions. Exact and approximate expressions for the decoherence and repopulation functions are discussed. A first pass is made over the exact treatment of multi-flavour partially incoherent oscillations.

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