Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989ap%26ss.151..235c&link_type=abstract
Astrophysics and Space Science (ISSN 0004-640X), vol. 151, no. 2, Jan. 1989, p. 235-254. Research supported by NSERC.
Astronomy and Astrophysics
Astrophysics
1
Big Bang Cosmology, Light Elements, Nuclear Astrophysics, Two Fluid Models, Universe, Abundance, Baryons, Deuterium, Einstein Equations, Helium
Scientific paper
In this article, nucleosynthesis will be investigated in a class of cosmological models in which two separate interacting fluids act as the source of the gravitational field with a comoving radiative perfect fluid modeling the cosmic-microwave background and a second fluid modeling the observed material content of the universe. The two-fluid models under consideration are found to predict primordial element abundances very similar to those predicted in the standard model and, consequently, in general accord with observed abundances. Since the evolution of the baryon density in the models is different from that in the standard model, the inferred limits on the present baryon density will also be different. In the models under investigation, the range of values for the present baryon density consistent with observed light element abundances is found to be far wider, in particular, the allowed upper limit on the present baryon density is found to be greater than in the standard case.
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