Abstract
We have recently considered cosmologies in which the universal scale factor varies as a power of the age of the Universe and concluded that they cannot satisfy the observational constraints on the present age, the magnitude-redshift relation for SN Ia, and the primordial element (D, ${}^{3}\mathrm{He},{ }^{4}\mathrm{He},$ and ${}^{7}\mathrm{Li})$ abundances. This claim has been challenged in a proposal that suggested a high baryon density model $({\ensuremath{\Omega}}_{B}{h}^{2}\ensuremath{\simeq}0.3)$ with an expansion factor varying linearly with time could be consistent with the observed abundance of primordial helium-4, while satisfying the age and magnitude-redshift constraints. In this paper we further explore primordial nucleosynthesis in generic power-law cosmologies, including the linear case, concluding that models selected to satisfy the other observational constraints are incapable of accounting for all the light element abundances.
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