Physics
Scientific paper
May 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996aps..may..i105f&link_type=abstract
American Physical Society, APS/AAPT Joint Meeting, May 2-5, 1996, abstract #I1.05
Physics
Scientific paper
Comparison of calculations of big bang nucleosynthesis with the observationally-inferred, albeit controversial, primordial abundances of ^2H, ^3He, ^4He, and ^7Li remains our best probe of the physics of the very early universe. These considerations have been utilized to put important constraints on fundamental neutrino physics and on the baryon content and net lepton number content of the universe. They also have been used to probe the distribution of entropy on small scales at the epoch of nucleosynthesis. Recent observations of absorption lines from Lyman-α clouds along the line of sight to high redshift quasars promise to reveal for the first time the true primordial abundance of deuterium. The implications of these startling but contradictory results for our picture of the early universe in general, and new constraints on neutrino physics in particular, will be discussed. This work was supported by NSF Grant PHY-9503384 and a NASA Theory Grant at UCSD.
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