Present status of primordial nucleosynthesis after WMAP: results from a new BBN code

Details Present status of primordial nucleosynthesis after WMAP: results from a new BBN code Present status of primordial nucleosynthesis after WMAP: results from a new BBN code

2003-07-10

arxiv.org/abs/astro-ph/0307213v5

Int.J.Mod.Phys.A19:4431-4454,2004

Astronomy and Astrophysics

Astrophysics

29 LaTeX pages, 23 figures. A mistake in Y_p quotation and minor typos corrected

Scientific paper

10.1142/S0217751X04019548

We report on the status of primordial nucleosynthesis in light of recent results on CMB anisotropies from WMAP experiment. Theoretical estimates for nuclei abundances, along with the corresponding uncertainties, are evaluated using a new numerical code, where all nuclear rates usually considered have been updated using the most recent available data. Moreover, additional processes, neglected in previous calculations, have been included. The combined analysis of CMB and primordial nucleosynthesis prediction for Deuterium gives an effective number of relativistic degrees of freedom in good agreement with the simplest scenario of three non degenerate neutrinos. Our findings seem to point out possible systematics affecting 4He mass fraction measurements, or the effect of exotic physics, like a slightly degenerate relic neutrino background.

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