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Open Access Publications from the University of California

Expanding cosmologies in brane geometries


Five dimensional gravity coupled, both in the bulk and on a brane, to a scalar Liouville field yields a geometry confined to a strip around the brane and with time dependent scale factors for the four geometry. In various limits known models can be recovered as well as a temporally expanding four geometry with a warp factor falling exponentially away from the brane. The effective theory on the brane has a time dependent Planck mass and “cosmological constant.” Although the scale factor expands, the expansion is not an acceleration. © 2004 The American Physical Society.

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