Testing the Friedmann equation: The Expansion of the universe during big bang nucleosynthesis
Aug, 2001
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Abstract: (arXiv)
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.Note:
- 18 pages, Final version to be published in Phys. Rev. D
- 98.80.Es
- 26.35.+c
- Friedman model
- Hubble constant
- light nucleus: production
- neutrino antineutrino: asymmetry
- general relativity
- energy: density
- numerical calculations: interpretation of experiments
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