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We report on a detailed numerical calculation of the minimum mass of stable, massive neutrinos in order that the contribution of the primordial neutrinos not exceed allowable limits on the present mass density of the Universe. We find limits M1. 3--4. 2 GeV for Dirac neutrinos, and M4. 9--13 GeV for Majorana neutrinos, in qualitative agreement with previous estimates.
Kolb et al. (Sat,) studied this question.
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