Physics
Scientific paper
Oct 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982rspta.307...43s&link_type=abstract
(Royal Society, Discussion on the Big Bang and Element Creation, London, England, Mar. 11, 12, 1982.) Royal Society (London), Ph
Physics
11
Abundance, Baryons, Big Bang Cosmology, Elementary Particle Interactions, Helium Isotopes, Nuclear Fusion, Dark Matter, Deuterium, Galactic Clusters, Lithium Isotopes, Neutrinos, Particle Density (Concentration), Photons, Universe
Scientific paper
It is shown that it is possible to obtain a lower bound on the ratio of baryons to photons in the Universe, E, from Big Bang nucleosynthesis through the use of He-3 and deuterium, and that this limit is consistent with the Li-7 abundance. It is shown that this limit places very narrow bounds on the allowed value for E, thus tightly constraining the neutrino limits to no more than four species. The derived constraints are that E must be between 1.5 x 10 to the -10 and 7 x 10 to the -9 with a best fit between 3 and 6 x 10 to the -10. With reference to dark matter, the derived baryon density for Big Bang nucleosynthesis corresponds very closely with the implied density of matter in binaries and small groups of galaxies, implying that nonbaryonic matter is not dominant by a large factor on scales as large as binaries and small groups of galaxies.
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