Physics
Scientific paper
Nov 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987ap%26ss.138..393c&link_type=abstract
Astrophysics and Space Science (ISSN 0004-640X), vol. 138, no. 2, Nov. 1987, p. 393-401. NSERC-supported research.
Physics
1
Baryons, Big Bang Cosmology, Density Distribution, Matter (Physics), Nuclear Fusion, Radiation Effects, Astronomical Models, Gravitational Fields, Microwaves, Universe
Scientific paper
The constraints on the present baryon density from primordial nucleosynthesis in universes with interacting radiation and matter are investigated. For illustration, a class of exact cosmological models is studied in which two separate, interacting fluids act as the source of the gravitational field, a radiative perfect fluid modelling the cosmic microwave background and a second perfect fluid modelling the observed material content of the universe. Although the two fluid models under consideration are found to predict primordial element abundances similar to those predicted in the standard model (and consequently in general accord with observed values), the upper limit on the present baryon density inferred from the observed abundances of the light elements is found to be greater than that in the standard model due to the different evolution of the baryon density in the models. From this result, and using the fact that the upper limit on OmegaB (the ratio of the present value of the baryon density to the value of the critical density) is further weakened in inhomogeneous cosmological models, it is found that unlike the situation in the standard model, cosmologies with OmegaB of about 1 are permitted without violating the constraints of nucleosynthesis, thereby allowing the possibility that the universe could be closed by baryonic matter alone.
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