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Relic neutrino asymmetry evolution from first principles

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arxiv hep-ph/9809363 v3 pith:XLFZB4TX submitted 1998-09-14 hep-ph astro-ph

classification hep-phastro-ph
keywords neutrinoexactapproximateasymmetrydecoherenceequationsevolutionfirst
verification ladder T0 review T1 audit T2 compute T3 formal
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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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Cited by 3 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Opening up New Parameter Space for Sterile Neutrino Dark Matter

    hep-ph 2025-05 conditional novelty 8.0 of 10

    A new production channel, nu_a + nu_a -> nu_s + nu_s, mediated by a heavy scalar, can generate the observed sterile neutrino dark matter abundance independently of active-sterile mixing.

  2. Sterile Neutrino Dark Matter as a Probe of Inflationary Reheating

    hep-ph 2026-01 conditional novelty 5.0 of 10

    Inflaton decays during reheating can produce all of the observed sterile-neutrino dark matter with a branching ratio below 10^-4, evading X-ray bounds and making a future X-ray line a probe of the inflaton mass and re...

  3. Non-adiabatic transitions in the density matrix formalism

    quant-ph 2026-06 unverdicted novelty 4.0 of 10

    The paper derives a density-matrix perturbation formula for two-state non-adiabatic transitions that reproduces the Landau-Zener result only to first order.

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