Big-bang Nucleosynthesis Enters the Precision Era

Abstract

The last parameter of big-bang nucleosynthesis, the baryon density, is being pinned down by measurements of the deuterium abundance in high-redshift hydrogen clouds. When it is determined, it will fix the primeval light-element abundances. D, ^3He and ^7Li will become ``tracers'' for the study of Galactic and stellar chemical evolution, and big-bang nucleosynthesis will become an even sharper probe of particle physics, e.g., the bound to the number of light neutrino species will be tightened significantly. Two key tests of the consistency of the standard theory are on the horizon: an independent, high-precision determination of the baryon density from anisotropy of the cosmic background radiation and a precision determination of the primeval ${}^4$He abundance.

19 pages Latex; 8 eps figures; submitted to Rev Mod Phys (Colloquia)

References in corpus (1)

• A High Deuterium Abundance at z=0.7

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