Relic neutrino asymmetry evolution from first principles

Nicole F. Bell, Raymond R. Volkas, and Yvonne Y. Y. Wong
Phys. Rev. D 59, 113001 – Published 14 April 1999
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Abstract

The exact quantum kinetic equations for a two-flavor 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 at an exact treatment of multi-flavor partially incoherent oscillations.

  • Received 14 September 1998

DOI:https://doi.org/10.1103/PhysRevD.59.113001

©1999 American Physical Society

Authors & Affiliations

Nicole F. Bell*, Raymond R. Volkas, and Yvonne Y. Y. Wong

  • School of Physics, Research Centre for High Energy Physics, The University of Melbourne, Parkville 3052, Australia

  • *Email address: n.bell@physics.unimelb.edu.au
  • Email address: r.volkas@physics.unimelb.edu.au
  • Email address: y.wong@physics.unimelb.edu.au

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Issue

Vol. 59, Iss. 11 — 1 June 1999

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