Abstract
We study the νμ and ντ decays in the early epoch of the universe. If mνr > 2me, there would be a CP asymmetry between and . The resultant CP non-invariance is a function of temperature and density and can reach 10-7 for a reasonable temperature range, but it is noticed that if mνr > 2me ~ 200 MeV, the CP non-invariance can be much larger.
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