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Brane world cosmology
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DOI：10.1088/0034-4885/67/12/R02.png)
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Abstract
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Recent developments in the physics of extra dimensions have opened up new avenues to test such theories. We review cosmological aspects of brane world scenarios such as the Randall-Sundrum brane model and two-brane systems with a bulk scalar field. We start with the simplest brane world scenario leading to a consistent cosmology: a brane embedded in an anti-de Sitter space-time. We generalize this setting to the case with a bulk scalar field and then to two-brane systems. We discuss different ways of obtaining a low-energy effective theory for two-brane, systems, such as the moduli space approximation and the low-energy expansion. A comparison between the different methods is given. Cosmological perturbations are briefly discussed as well as early universe scenarios such as the cyclic model and the born-again brane world model. Finally we also present some physical consequences of brane, world scenarios on the cosmic microwave background and the variation of constants.
Keywords:
DENSITY PERTURBATIONS
GRAVITATIONAL-WAVES
BLACK-HOLES
BULK
RADION
GRAVITY
EVOLUTION
STABILIZATION
INFLATION
EXPANSION
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