What Is The BBN Prediction for the Baryon Density and How Reliable Is It?

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  • 31 August 2000
Abstract
Together, the standard theory of big-bang nucleosynthesis (BBN) and the primeval deuterium abundance very precisely peg the baryon density, Omega_B h^2 = 0.0190\pm 0.0018 (95% cl). The uncertainty is due to that in the deuterium abundance and input nuclear data, in the ratio of about 2 to 1. We discuss critically the reliability of the BBN baryon density, and conclude that within the standard cosmology and standard theory of BBN a baryon density Omega_B h^2 = 0.030 (the central value implied by recent CMB anisotropy measurements) simply cannot be accommodated.

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