Astronomy and Astrophysics – Astrophysics
Scientific paper
1997-09-25
In From Quantuum fluctuations to cosmological structures, D. Valls-Gabaud, M. Hendry, P. Molaro and K. Chamcham Eds. ASP Conf.
Astronomy and Astrophysics
Astrophysics
18 pages, 6 figures Proceedings of the first Moroccan School of Astrophysics Casablanca, Morocco, 1-10 Dec 1996
Scientific paper
In this paper we review the present status of observations of the Big Bang elements D, 3He, 4He and 7Li and of their extrapolation to the primordial values. It is shown that, within the errors, the abundances are consistent with the predictions of the standard Big Bang nucleosynthesis for 1 < eta_10 < 6, which corresponds to 0.004 < Omega_b h_{0}^2 < 0.02$. Narrower consistencies in eta_{10} are still possible at about 1.7 or about 4, but in this case some of the observations of D and 4He should be incorrect. Finally, it is noted that "extragalactic" Li may have already been detected in a star possibly accreted by the Galaxy.
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