Testing The Friedmann Equation: The Expansion of the Universe During Big-Bang Nucleosynthesis

Details Testing The Friedmann Equation: The Expansion of the Universe During Big-Bang Nucleosynthesis Testing The Friedmann Equation: The Expansion of the Universe During Big-Bang Nucleosynthesis

2001-08-01

arxiv.org/abs/astro-ph/0108002v3

Phys.Rev. D65 (2002) 063507

Astronomy and Astrophysics

Astrophysics

18 pages, Final version to be published in Phys. Rev. D

Scientific paper

10.1103/PhysRevD.65.063507

In conventional general relativity, the expansion rate H of a Robertson-Walker universe is related to the energy density by the Friedmann equation. Aside from the present day, the only epoch at which we can constrain the expansion history in a model-independent way is during Big-Bang Nucleosynthesis (BBN). We consider a simple two-parameter characterization of the behavior of H during BBN and derive constraints on this parameter space, finding that the allowed region of parameter space is essentially one-dimensional. We also study the effects of a large neutrino asymmetry within this framework. Our results provide a simple way to compare an alternative cosmology to the observational requirement of matching the primordial abundances of the light elements.

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