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Primordial Nucleosynthesis
Coc A.
Dans Journal of Physics: Conference Series - 11th International Conference on Nucleus-Nucleus Collisions, San Antonio : États-Unis (2012) - http://hal.in2p3.fr/in2p3-00727269
Physique/Astrophysique/Cosmologie et astrophysique extra-galactique
Planète et Univers/Astrophysique/Cosmologie et astrophysique extra-galactique
Physique/Physique Nucléaire Expérimentale
Primordial Nucleosynthesis
A. Coc1
1 :  CSNSM - Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse
http://www-csnsm.in2p3.fr/
CNRS : UMR8609 – IN2P3 – Université Paris XI - Paris Sud
batiments 104 et 108 - 91405 Orsay Campus
France
CSNSM AN
Primordial nucleosynthesis, or Big-Bang Nucleosynthesis (BBN), is one of the three evidences for the Big-Bang model, together with the expansion of the Universe and the Cosmic Microwave Background. There is a good global agreement over a range of nine orders of magnitude between abundances of 4He, D, 3He and 7Li deduced from observations, and calculated in primordial nucleosynthesis. This comparison was used to determine the baryonic density of the Universe. For this purpose, it is now superseded by the analysis of the Cosmic Microwave Background (CMB) radiation anisotropies. However, there remain, a yet unexplained, discrepancy of a factor 3-5, between the calculated and observed lithium primordial abundances, that has not been reduced, neither by recent nuclear physics experiments, nor by new observations. We review here the nuclear physics aspects of BBN for the production of 4He, D, 3He and 7Li, but also 6Li, 9Be, 11B and up to CNO isotopes. These are, for instance, important for the initial composition of the matter at the origin of the first stars. Big-Bang nucleosynthesis, that has been used, to first constrain the baryonic density, and the number of neutrino families, remains, a valuable tool to probe the physics of the early Universe, like variation of "constants" or alternative theories of gravity.

Conférences invitées
2012
2012
Journal of Physics: Conference Series
420
10.1088/1742-6596/420/1/012136

11th International Conference on Nucleus-Nucleus Collisions
San Antonio
États-Unis
27/05/2012
01/06/2012
A. Coc

CSNSM AN
BIG-BANG NUCLEOSYNTHESIS – THERMONUCLEAR REACTION-RATES – NUCLEAR-REACTION RATES – INHOMOGENEOUS COSMOLOGIES – HEAVY-ELEMENTS – HALO-STARS – ABUNDANCE – LITHIUM – SENSITIVITY – CONSTANTS
Lien vers le texte intégral : 
http://fr.arXiv.org/abs/1208.4748