A constraint on the universal baryon density from the abundance of Li-7

Details A constraint on the universal baryon density from the abundance of Li-7 A constraint on the universal baryon density from the abundance of Li-7

Oct 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977natur.269..782a&link_type=abstract

Nature, vol. 269, Oct. 27, 1977, p. 782. NSF-supported research.

Physics

14

Abundance, Baryons, Big Bang Cosmology, Lithium Isotopes, Space Density, Hydrogen Clouds, Universe

Scientific paper

Procedures for estimating the mean baryon density of the universe have been based on the observed interstellar abundance of H-2. The correctness of these procedures depends on the validity of the assumption that all H-2 was formed in a big bang. For a confirmation of conclusions concerning a continuing expansion of the universe according to considerations based on this assumption, it appears, therefore, desirable to employ also an approach which does not depend on H-2. Such an approach could be based on the study of Li-7 abundances if the fraction of the observed Li-7 made in the big bang were known. Unfortunately estimates regarding this fraction must be regarded with scepticism. However, Li-7 observations can be used to place an upper limit on the mean baryon density. It is found that this limit favors also an open universe.

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