Precision Cosmology and the Density of Baryons in the Universe

Details Precision Cosmology and the Density of Baryons in the Universe Precision Cosmology and the Density of Baryons in the Universe

2000-07-31

arxiv.org/abs/astro-ph/0007454v2

Phys.Rev.Lett. 86 (2001) 385

Astronomy and Astrophysics

Astrophysics

Matches version accepted for publication in Physical Review Letters

Scientific paper

10.1103/PhysRevLett.86.385

Big-bang Nucleosynthesis (BBN) and Cosmic Microwave Background (CMB) anisotropy measurements give independent, accurate measurements of the baryon density and can test the framework of the standard cosmology. Early CMB data are consistent with the longstanding conclusion from BBN that baryons constitute a small fraction of matter in the Universe, but may indicate a slightly higher value for the baryon density. We clarify precisely what the two methods determine, and point out that differing values for the baryon density can indicate either an inconsistency or physics beyond the standard models of cosmology and particle physics. We discuss other signatures of the new physics in CMB anisotropy.

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