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Updated Big Bang Nucleosynthesis Compared with Wilkinson Microwave Anisotropy Probe Observations and the Abundance of Light Elements

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© 2004. The American Astronomical Society. All rights reserved. Printed in U.S.A.
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Author affiliations

1 Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse, IN2P3-CNRS and Université Paris Sud, Bâtiment 104, F-91405 Orsay Campus, France

2 Institut d'Astrophysique de Paris, CNRS, 98 bis, Boulevard Arago, F-75014 Paris, France

3 Physique Nucléaire Théorique et Physique Mathématique, CP229, Université Libre de Bruxelles, B-1050 Brussels, Belgium

4 Centre de Recherches du Cyclotron, Université Catholique de Louvain, Chemin du Cyclotron 2, B-1348 Louvain-La-Neuve, Belgium

5 Permanent address: Laboratoire de Physique des Hautes Energie et Astrophysique, FSSM, Université Caddi Ayyad, Marrakech, Morocco

Dates

Received 2003 July 23
Accepted 2003 September 24

Citation

Alain Coc et al 2004 ApJ 600 544

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DOI

https://doi.org/10.1086/380121

Keywords

cosmological parameters; early universe; nuclear reactions, nucleosynthesis, abundances

Journal RSS feed

0004-637X/600/2/544

Abstract

We improve standard big bang nucleosynthesis (SBBN) calculations by taking into account new nuclear physics analyses (the 2003 work of Descouvemont and coworkers). Using a Monte Carlo technique, we calculate the abundances of light nuclei (D, 3He, 4He, and 7Li) versus the baryon-to-photon ratio. The results concerning Ωbh2 are compared with relevant astrophysical and cosmological observations: the abundance determinations in primitive media and the results from cosmic microwave background (CMB) experiments, especially the Wilkinson Microwave Anisotropy Probe (WMAP) mission. Consistency between WMAP, SBBN results, and D/H data strengthens the deduced baryon density and has interesting consequences on cosmic chemical evolution. A significant discrepancy between the calculated 7Li abundance deduced from WMAP and the Spite plateau is clearly revealed. To explain this discrepancy, three possibilities are invoked: systematic uncertainties on the Li abundance, surface alteration of Li in the course of stellar evolution, or poor knowledge of the reaction rates related to 7Be destruction. In particular, the possible role of the up to now neglected 7Be(d, p)2 α and 7Be(d, α)5Li reactions is considered. Another way to reconcile these results coming from different horizons consists of invoking new, speculative primordial physics that could modify the nucleosynthesis emerging from the big bang and perhaps the CMB physics itself. The impressive advances in CMB observations provide a strong motivation for more efforts in experimental nuclear physics and high-quality spectroscopy to keep SBBN in pace.

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