On "Observational Constraints on Power-Law Cosmologies"

Details On "Observational Constraints on Power-Law Cosmologies" On "Observational Constraints on Power-Law Cosmologies"

1999-03-05

arxiv.org/abs/astro-ph/9903084v1

Phys.Rev. D60 (1999) 108301

Astronomy and Astrophysics

Astrophysics

Plain Tex File, 4 postscript figures

Scientific paper

"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 $\approx 8.1\times 10^{-9}$.

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