Big-Bang Nucleosynthesis and Galactic Chemical Evolution

Details Big-Bang Nucleosynthesis and Galactic Chemical Evolution Big-Bang Nucleosynthesis and Galactic Chemical Evolution

1995-06-16

arxiv.org/abs/astro-ph/9506094v2

Astrophys.J. 455 (1995) L95

Astronomy and Astrophysics

Astrophysics

9 pages, LaTeX(2.09), 4 postscript figures (attached). A postscript version with figures can be found at ftp://astro.uchicag

Scientific paper

10.1086/309836

Deuterium is the best indicator of the baryon density; however, only its present abundance is known (and only locally) and its chemical evolution is intertwined with that of $^3$He. Because galactic abundances are spatially heterogeneous, mean chemical-evolution models are not well suited for extrapolating the pre-solar D and $^3$He abundances to their primeval values. We introduce a new approach which explicitly addresses heterogeneity, and show that the decade-old big-bang nucleosynthesis concordance interval $\eta \approx (2 -8)\times 10^{-10}$ based on D and $^3$He is robust.

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