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Brane World Cosmology, the CMB and the Radion

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arxiv astro-ph/0503467 v1 pith:E4HVZAET submitted 2005-03-22 astro-ph hep-phhep-th

Brane World Cosmology, the CMB and the Radion

classification astro-ph hep-phhep-th
keywords fieldbrane-worldcosmologicalinvestigatedmodelmoduliradionaction
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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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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