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Supernova bound on keV-mass sterile neutrinos reexamined · Around

2011

Supernova bound on keV-mass sterile neutrinos reexamined

Raffelt, Georg G., Zhou, Shun

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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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