Supernova bound on keV-mass sterile neutrinos reexamined

Details Supernova bound on keV-mass sterile neutrinos reexamined Supernova bound on keV-mass sterile neutrinos reexamined

2011-02-24

arxiv.org/abs/1102.5124v2

Phys.Rev.D83:093014,2011

Physics

High Energy Physics

High Energy Physics - Phenomenology

6 pages, 4 figures; minor changes, references updated, matches the published version

Scientific paper

10.1103/PhysRevD.83.093014

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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