Abstract
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, a comoving radiative perfect fluid modelling the cosmic-microwave background and a second fluid modelling 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 to 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, and 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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