Nucleosynthesis

Details Nucleosynthesis Nucleosynthesis

Dec 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986rspta.320..557p&link_type=abstract

(Royal Society Discussion on Material Content of the Universe, London, England, Oct. 23, 24, 1985) Royal Society (London), Philo

Computer Science

7

Baryons, Big Bang Cosmology, Density (Mass/Volume), Light Elements, Nuclear Fusion, Universe, Abundance, Dark Matter, Helium Isotopes, Lithium Isotopes, Stellar Composition

Scientific paper

Both Big-Bang and stellar nucleosynthesis have outcomes related to the density of baryonic matter, but whereas in the first case there is a standard model that makes very precise predictions of light element abundances as a function of the mean density of baryons in the universe, in the second case various uncertainties permit only very limited conclusions to be drawn. As far as Big-Bang synthesis and the light elements are concerned, existing results on D, He-3 and Li-7 indicate a value of Omega(N)h(0) exp 2 greater than 0.01 and less than 0.025, where Omega(N) is the ratio of baryonic density to the closure density and h(0) is the Hubble constant in units of 100 km/s per Mpc; probably h(0) of between 0.5 and 1. New results on the primordial helium abundance give a still tighter upper limit to Omega(N), Omega(N)h(0) exp 2 of less than 0.013, which when compared with redshift surveys giving Omega greater than 0.05 implies that the observed matter can all be baryonic only if the various uncertainties are stretched to their limits.

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