Nucleosynthesis in Power-Law Cosmologies

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, He3, He4, and Li7) abundances. This claim has been challenged in a proposal that suggested a high baryon density model (Omega_B*h*h = 0.3) with an expansion factor varing linearly with time could be consistent with the observed abundance of primoridal 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.

Matches version accepted for publication in Phys. Rev. D

References in corpus (8)

• Discovery of a Supernova Explosion at Half the Age of the Universe and its Cosmological Implications
• The Cosmic Baryon Budget
• Constraints on Cosmological Models from Hubble Space Telescope Observations of High-z Supernovae
• The Deuterium Abundance Towards Q1937-1009
• The Deuterium Abundance Towards Q1009+2956
• The baryon content of the Universe
• Observational Constraints On Power-Law Cosmologies
• Non-Nucleosynthetic Constraints on the Baryon Density and Other Cosmological Parameters

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