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Lepton Number-Driven Sterile Neutrino Production in the Early Universe

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arxiv 0802.3377 v3 pith:M52J6DFR submitted 2008-02-22 astro-ph hep-ph

classification astro-phhep-ph
keywords leptonneutrinosterileevolutionearlyenergyfindmixing
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We examine medium-enhanced, neutrino scattering-induced decoherent production of dark matter candidate sterile neutrinos in the early universe. In cases with a significant net lepton number we find two resonances, where the effective in-medium mixing angles are large. We calculate the lepton number depletion-driven evolution of these resonances. We describe the dependence of this evolution on lepton numbers, sterile neutrino rest mass, and the active-sterile vacuum mixing angle. We find that this resonance evolution can result in relic sterile neutrino energy spectra with a generic form which is sharply peaked in energy. We compare our complete quantum kinetic equation treatment with the widely-used quantum Zeno ansatz.

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Cited by 1 Pith paper

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  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.

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