The Baryon Density Through The (Cosmological) Ages

Details The Baryon Density Through The (Cosmological) Ages The Baryon Density Through The (Cosmological) Ages

2002-02-08

arxiv.org/abs/astro-ph/0202187v1

Fortsch.Phys. 50 (2002) 562-568

Astronomy and Astrophysics

Astrophysics

8 pages, 5 figures; To be published in the proceedings of the symposium, "100 Years Werner Heisenberg - Works and Impact" (eds

Scientific paper

The light element abundances probe the baryon density of the universe within a few minutes of the Big Bang. Of these relics from the earliest universe, deuterium is the baryometer of choice. By comparing its primordial abundance inferred from observations with that predicted by Big Bang Nucleosynthesis (BBN), the early universe baryon density is derived. This is then compared to independent estimates of the baryon density several hundred thousand years after the Big Bang and at present, more than 10 billion years later. The excellent agreement among these values represents an impressive confirmation of the standard model of cosmology.

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