BRANS--DICKE COSMOLOGY.

摘要: We discuss the implications of Brans-Dicke scalar-tensor theory for cosmology with particular emphasis on primordial element abundances that would obtain. Two general classes models are found. Models one class expand through nuclear burning stage slightly more rapidly than relativistic case: other may at any rate whatsoever. The first yeilds D, He3 and He4 in agreement their values if present mass density is low. High-density cosmologies, however, produce too much He4. second yields which far high unless expansion was quite large: this case no all produced. Finally, we determine change constant gravitationG epoch. For but a very small Ġ negative positive epoch whatsoever, have ages significantly lower corresponding ages.