Primordial Nucleosynthesis as a Test of the Friedmann Equation in the Early Universe

Details Primordial Nucleosynthesis as a Test of the Friedmann Equation in the Early Universe Primordial Nucleosynthesis as a Test of the Friedmann Equation in the Early Universe

2003-02-26

arxiv.org/abs/astro-ph/0302554v2

Phys.Rev. D68 (2003) 123504

Astronomy and Astrophysics

Astrophysics

6 figures. Revised version. Matches with the accepted one for publication in PRD

Scientific paper

10.1103/PhysRevD.68.123504

In the standard hot big bang model, the expansion of the early universe is given by the Friedmann equation with an energy density dominated by relativistic particles. Since in a variety of models this equation is altered, we introduce modifications in the Friedmann equation and show that we can constrain them using big bang nucleosynthesis data. When there is no neutrino/antineutrino asymmetry these modifications are tightly bounded but in presence of an asymmetry the bounds become much looser. As an illustration, we apply our results to a model where the second and third families couple to gravity differently than the first family (non-universal gravity).

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