Abstract
Standard models of Big Bang nucleosynthesis (BBN) are those which are the best suited to account for the production of D, 3He, 4He and 7Li, the abundances of which range over about 10 decades. These models are briefly reviewed and compared to more complex ones like those which take into account any possible inhomogeneities resulting from the Quark—Hadron phase transition. Recent abundance determinations (in particular the D abundance in a large redshift extragalactic systems) do not modify our appraisal of the success of the standard BBN models. Should they be confirmed, they would lead to more stringent limits on the baryonic density of the Universe which could be close to that of the “visible matter”. Furthermore, specific schemes of galactic evolution should be invoked to account for a possibly large galactic destruction of D unconnected with a large 3He variation.
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