Stringent cosmological bounds on inert neutrino mixing

1991
31 pages
Published in:
  • Nucl.Phys.B 373 (1992) 498-528
  • Published: 1992

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Abstract: (Elsevier)
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 (sin 2 2 θ 0 − δm 2 ) plane are determined carefully for mixing involving ν e , ν γ and ν τ 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.
  • neutrino: oscillation
  • neutrino: singlet
  • neutrino: doublet
  • neutrino: mass
  • mass: neutrino
  • neutrino: mixing angle
  • neutrino: right-handed
  • neutrino: lifetime
  • neutrino: width
  • resonance: oscillation