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Abstract: (arXiv)
Systematic uncertainties in the light-element abundances and their evolution make a rigorous statistical assessment difficult. However, using Bayesian methods we show that the following statement is robust: the predicted and measured abundances are consistent with 95\% credibility only if the baryon-to-photon ratio is between 2×10 102\times 10~{-10} and 6.5×10 106.5\times 10~{-10} and the number of light neutrino species is less than 3.9. Our analysis suggests that the  4~4He abundance may have been systematically underestimated.
  • light nucleus: production
  • production: light nucleus
  • baryon: asymmetry
  • neutrino: flavor
  • astrophysics
  • numerical calculations: interpretation of experiments
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