On "Observational Constraints on Power-Law Cosmologies"

“Power Law Cosmologies” are defined by their growth of the cosmological scale factor as $t^{\alpha }$ regardless of the matter content or cosmological epoch. Constraints from the current age of the Universe and from the high redshift supernovae data require ``large’’ $\alpha$ ($\approx 1$). We reinforce this by latest available observations. Such a large $\alpha$ is also consistent with the right amount of helium and the lowest observed metallicity in the universe for a model with the baryon entropy ratio $\approx 8.1\times {10}^{-9}$.