Heavy sterile neutrinos: Bounds from big-bang nucleosynthesis and SN 1987A
A. D. Dolgov, S. H. Hansen, G. Raffelt, D. V. Semikoz
Abstract
Cosmological and astrophysical effects of heavy (10 - 200 MeV) sterile Dirac neutrinos, mixed with the active ones, are considered. The bounds on mass and mixing angle from both supernovae and big-bang nucleosynthesis are presented.
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