Brane-world cosmology and varying GG

preprint2009arXivOpen access

Abstract

We consider a brane-world cosmological model coupled to a bulk scalar field. Since the brane tension turns out to be proportional to Newton coupling GG, in such a model a time variation of GG naturally occurs. By resorting to available bounds on the variation of GG, the parameters of the model are constrained. The constraints coming from nucleosynthesis and CMB result to be the severest ones.

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