Big-Bang Nucleosynthesis and the Baryon Density of the Universe

Abstract

Big-bang nucleosynthesis is one of the cornerstones of the standard cosmology. For almost thirty years its predictions have been used to test the big-bang model to within a fraction of a second of the bang. The concordance that exists between the predicted and observed abundances of D, ${}^3$He, ${}^4$He and ${}^7$Li provides important confirmation of the standard cosmology and leads to the most accurate determination of the baryon density, between $1.7 \times 10^{-31}\gcmm3$ and $4.1\times 10^{-31}\gcmm3$ (corresponding to between about 1\% and 14\% of critical density). This measurement of the density of ordinary matter is crucial to almost every aspect of cosmology and is pivotal to the establishment of two dark-matter problems: (i) most of the baryons are dark, and (ii) if the total mass density is greater than about 14\% of the critical density as many determinations now indicate, the bulk of the dark matter must be ``nonbaryonic,'' comprised of elementary particles left from the earliest moments. We critically review the present status of primordial nucleosynthesis and discuss future prospects.

21 pages+6 figs, LaTeX(2.09), FERMILAB-Pub-94/174-A, Figures available by anonymous ftp in oddjob.uchicago.edu:/pub/bbnrev/fig?.ps (?=1,2,3,4,5,6) or email from [email protected] REVISIONS include new discussion and a new figure

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