Brane World Cosmology, the CMB and the Radion

Details Brane World Cosmology, the CMB and the Radion Brane World Cosmology, the CMB and the Radion

2005-03-22

arxiv.org/abs/astro-ph/0503467v1

Astronomy and Astrophysics

Astrophysics

11 pages, 6 figures, to appear in the proceedings of the DPU Workshop: The Density Fluctuations in the Universe: Beyond the In

Scientific paper

10.1016/j.nuclphysbps.2005.04.05

Recent developments in the theory of extra dimensions have opened up avenues to confront such theories with cosmological tests. We discuss a brane-world model with a bulk scalar field, motivated by supergravity. The low-energy effective action is derived and physical constraints on the parameters of the model discussed. The cosmological evolution of the brane-world moduli is investigated and it is shown that one of the moduli is a quintessence field. The CMB predictions are computed. Finally, the possibility that the radion field in brane-worlds could be a chameleon field is investigated.

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