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• W1987680206 abstract "Abstract 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 θ mix ⋍ 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." @default.
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• W1987680206 date "1989-04-01" @default.
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• W1987680206 title "Singlet neutrinos in cosmology" @default.
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• W1987680206 doi "https://doi.org/10.1016/0550-3213(89)90041-2" @default.
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