Singlet neutrinos in cosmology

Details Singlet neutrinos in cosmology Singlet neutrinos in cosmology

Apr 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989nuphb.316..456e&link_type=abstract

Nuclear Physics B, Volume 316, Issue 2, p. 456-468.

Physics

Nuclear Physics

9

Scientific paper

We compute the relic energy density of stable, superweakly interacting singlet neutrinos in E6-derived models. We show that the cosmological mass limits on these neutrinos depend crucially on the mixing of the ordinary Z boson and a new neutral weak boson Z'. For largest allowable mixing angle θmix ⋍ 0.1 we find a lower limit, practically independent of Z' mass, of mN >~ 22 GeV for Dirac neutrinos and mN >~ 32 GeV for Majorana neutrinos. Independently of the mixing angle the relic density will be bigger than the energy density of visible matter for a wide range of the parameters mN, mZ'. Hence these singlet neutrinos are a natural candidate for a cold component of dark matter in the Universe.

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