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Supernova bound on keV-mass sterile neutrinos reexamined

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arxiv 1102.5124 v2 pith:4M7JDVGL submitted 2011-02-24 hep-ph astro-ph.SR

Georg G. Raffelt , Shun Zhou This is my paper · ORCID
classification hep-phastro-ph.SR
keywords mixingangleemissionmatterrangesupernovatau-active-sterile
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Active-sterile neutrino mixing is strongly constrained for m_s > 100 keV to avoid excessive energy losses from supernova cores. For smaller m_s, matter effects suppress the effective mixing angle except for a resonant range of energies where it is enhanced. We study the case of \nu_tau-\nu_s-mixing where a \nu_tau-\bar\nu_tau asymmetry builds up due to the strong excess of \nu_s over \bar\nu_s emission or vice versa, reducing the overall emission rate. In the warm dark matter range m_s < 10 keV the mixing angle is essentially unconstrained.

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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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