Nucleosynthesis in Power-Law Cosmologies

Details Nucleosynthesis in Power-Law Cosmologies Nucleosynthesis in Power-Law Cosmologies

1999-11-04

arxiv.org/abs/astro-ph/9911066v2

Phys.Rev. D61 (2000) 103507

Astronomy and Astrophysics

Astrophysics

Matches version accepted for publication in Phys. Rev. D

Scientific paper

10.1103/PhysRevD.61.103507

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.

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