Abstract
Possible modifications of the standard big-bang nucleosynthesis scenario, which would loosen the bound on the number of neutrino flavors, are examined. A concrete model with light ((mx=O( MeV )) quasistable particles (τx~1 s ) decaying into [Formula: see text] is considered. If the decay products do not thermalize they shift the frozen neutron-to-proton ratio and respectively the abundance of the light element produced primordially. The direction of this shift depends on the parameters of the model. Correspondingly for the particular choice of these parameters the restrictions on the number of neutrino flavors may be considerably weakened.
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