Stringent cosmological bounds on inert neutrino mixing

Details Stringent cosmological bounds on inert neutrino mixing Stringent cosmological bounds on inert neutrino mixing

Apr 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992nuphb.373..498e&link_type=abstract

Nuclear Physics B, Volume 373, Issue 2, p. 498-528.

Physics

Nuclear Physics

179

Scientific paper

We study neutrino oscillations in the early universe induced by a non-trivial vacuum mixing between an inert SU(2)×U(1) singlet and a weakly interacting doublet neutrino. Excluded regions in the (sin2 2θ0 - δm2) plane are determined carefully for mixing involving νe, νγ and ντ neutrinos with an inert partner. The bounds are much more stringent than those obtained from earthbound experiments. Much of the large-angle MSW-solution parameter range is excluded and severe constraints are placed on the proposed 17 keV netrino.

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