Abstract
The review of the primordial nucleosynthesis presented in the honor of the memory of Mgr Georges Lemaitre is divided in three chapters: in the first one attempts to determine the primordial abundances of the lightest elements which can be formed by the Big Bang nucleosynthesis. This analysis leads to fairly large uncertainty ranges due to dispersions in the observations and also in the case of Deuterium to the still arbitrary choice between different models of galactic evolution.
Chapter 2 is a summary of the Standard Big Bang nucleosynthesis where it is recalled that (i) the abundances of D, 3He and 7Li allow to predict that the baryonic cosmological parameter is 0. 10 +0.11-0.09 (i.e leading to a open universe if baryons are the major constituants of the matter of the Universe; and (ii) that the He primordial abundance is consistent with the three different types of neutrinos which are presently observed. This simple and attractive model might be found in difficulty in the case of a primordial abundance of He ≤ 0.24 and/or in the case of models of galactic evolution allowing infall of external matter having a primordial composition.
Finally chapter 3 summarizes two alternative proposals to the Standard Big Bang nucleosynthesis : the possible production of D by partial photodisintegration of He induced by energetic photons coming from the decay of massive and unstable neutrinos or some (at present quite unlikely !) spallation mechanisms induced by pregalactic cosmic rays on a pure hydrogen primitive interstellar/pregalactic gas.
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© 1984 D. Reidel Publishing Company, Dordrecht, Holland
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Audouze, J. (1984). The Primordial Nucleosynthesis. In: Berger, A. (eds) The Big Bang and Georges Lemaître. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-6487-7_4
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