Physics – Plasma Physics
Scientific paper
Oct 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003aps..dppqi2006w&link_type=abstract
American Physical Society, 45th Annual Meeting of the Division of Plasma Physics, October 27-31, 2003, Albuquerque, New Mexico,
Physics
Plasma Physics
Scientific paper
The temperature fluctuations in the cosmic microwave background discovered by COBE in 1992 are sound waves in a peculiar type of self-gravitating fluid. Most of the density is in ``dark matter'', while the pressure comes from light. There are two very different ``sound'' speeds, so oscillations in different components get out of phase during the first 380,000 years after the Big Bang. The resulting interference generates characteristic angular sizes in the pattern of the anisotropy which tell us about the composition of the Universe. The first results from the WMAP satellite give values for the baryonic density, dark matter density and vacuum energy density that are accurate to 8% or better. While the Universe became neutral 380,000 years after the Big Bang, the polarization pattern observed by WMAP shows that the reionization of the Universe occured quite early, only 200 million years after the Big Bang.
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