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Revised Uncertainties in Big Bang Nucleosynthesis

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arxiv 1706.02834 v1 pith:X7TXAERP submitted 2017-06-09 astro-ph.CO

classification astro-ph.CO
keywords bangnucleosynthesisusedabundancesanalysisbaryon-to-photoncalculationscarlo
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Big Bang Nucleosynthesis (BBN) explores the first few minutes of nuclei formation after the Big Bang. We present updates that result in new constraints at the 2{\sigma} level for the abundances of the four primary light nuclides - D,3He,4He, and 7Li - in BBN. A modified standard BBN code was used in a Monte Carlo analysis of the nucleosynthesis uncertainty as a function of baryon-to-photon ratio. Reaction rates were updated to those of NACRE and REACLIB, and R-Matrix calculations. The results are then used to derive a new constraint on the effective number of neutrinos.

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