Cosmologies with massive neutrinos and large value of Hubble constant.

Details Cosmologies with massive neutrinos and large value of Hubble constant. Cosmologies with massive neutrinos and large value of Hubble constant.

Jun 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995ncimc..18..281b&link_type=abstract

Nuovo Cimento C, Vol. 18C, N. 3, p. 281 - 284

Physics

Cosmology: Neutrinos

Scientific paper

If neutrino masses are related by the see-saw relation and m(νμ) ≡ 2 - 3 eV, the τ-neutrino must be allowed to decay. Taking into account measurements of the cosmic expansion, which yield h ⪆ 0.8, the relativistic products of the decay of ντ can delay the equivalence as though it were h ≍ 0.3, so providing a transfer function easy to reconcile with LSS data. This result is obtainable also if the actual final contribution of νμ to the present cosmic density is as low as 4% of the critical density. Still keeping the above neutrino mass scale and h ≡ 0.8, alternative choices of physical parameters lead to an earlier equivalence and to a more significant hot component. Altogether, a whole class of models, with hot components characterized by 0.04 ⪉ Ωh ⪉ 5 0.2, can be devised, most of which can be expected to be in reasonable agreement with the data.

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