Astronomy and Astrophysics – Astrophysics
Scientific paper
2000-05-30
JHEP0009:038,2000
Astronomy and Astrophysics
Astrophysics
LaTeX2e, 41 pages, 20 figures. Minor changes and 4 figures slightly modified
Scientific paper
10.1088/1126-6708/2000/09/038
We report the results on Big Bang Nucleosynthesis (BBN) based on an updated code, with accuracy of the order of 0.1% on He4 abundance, compared with the predictions of other recent similar analysis. We discuss the compatibility of the theoretical results, for vanishing neutrino chemical potentials, with the observational data. Bounds on the number of relativistic neutrinos and baryon abundance are obtained by a likelihood analysis. We also analyze the effect of large neutrino chemical potentials on primordial nucleosynthesis, motivated by the recent results on the Cosmic Microwave Background Radiation spectrum. The BBN exclusion plots for electron neutrino chemical potential and the effective number of relativistic neutrinos are reported. We find that the standard BBN seems to be only marginally in agreement with the recent BOOMERANG and MAXIMA-1 results, while the agreement is much better for degenerate BBN scenarios for large effective number of neutrinos, N_\nu \sim 10.
Esposito Salvatore
Mangano Gianpiero
Miele Gennaro
Pisanti Ofelia
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