Abstract
Cosmological scenarios with massive unstable neutrinos are discussed. Restrictions on the mass and the lifetime of the unstable neutrino are derived from (a) age and mass density of the universe and (b) the growth of primordial fluctuations. It will not be possible to accommodate unstable neutrinos with masses above ∼ 1 ke V in standard cosmology unless they have exceedingly small lifetime: Τ <5 × 108 s.
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Vasanthi, M.M., Padmanabhan, T. Constraints on unstable heavy neutrinos from cosmology. J Astrophys Astron 7, 59–70 (1986). https://doi.org/10.1007/BF02715028
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DOI: https://doi.org/10.1007/BF02715028