2002/05/08 by Subir Sarkar
Physics and Astronomy · #astro-ph #hep-ph
published as in "Frontiers of the Universe", eds L Celnekier and J Tran Thanh Van (The Gioi Publishers, 2004) pp.53-63 · 14 pages, 5 figures (LaTeX); Invited talk at the XIII Recontres de Blois "Frontiers of the Universe", 17-23 June 2001
arxiv created 2002/05/08 · arxiv updated 2009/11/30
The relic abundance of baryons - the only form of stable matter whose existence we are certain of - is a crucial parameter for many cosmological processes, as well as material evidence that there is new physics beyond the Standard Model. We discuss recent determinations of the cosmological baryon density from analysis of the abundances of light elements synthesised at the end of ``the first three minutes'', and from the observed temperature anisotropies imprinted on small angular-scales in the cosmic microwave background when the universe was about 100,000 yr old.