Cosmic acceleration in models with density dependent moduli

Details Cosmic acceleration in models with density dependent moduli Cosmic acceleration in models with density dependent moduli

2004-03-12

arxiv.org/abs/hep-th/0403138v4

Phys.Rev. D70 (2004) 084020

Physics

High Energy Physics

High Energy Physics - Theory

16 pages, 2 figures. Revised to match published version

Scientific paper

10.1103/PhysRevD.70.084020

The effective equation of state of normal matter is changed in theories where the size of the compact space depends upon the local energy density. In particular we show how the dilution of a fluid due to the expansion of the universe can be compensated by an increase of the effective coupling of that fluid to gravity in the presence of a potential which acts to reduce the size of the compact space. We estimate how much cosmic acceleration can be obtained in such a model and comment on the difficulties faced in finding an appropriate potential.

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