Cosmological expansion on a dilatonic brane-world

Details Cosmological expansion on a dilatonic brane-world Cosmological expansion on a dilatonic brane-world

2000-08-24

arxiv.org/abs/hep-th/0008192v2

Class.Quant.Grav.18:2171-2194,2001

Physics

High Energy Physics

High Energy Physics - Theory

20 pages - Version to appear in Classical and Quantum Gravity. New section added on conformal rescaling of the metric. Some ot

Scientific paper

10.1088/0264-9381/18/11/313

In this paper we study brane-world scenarios with a bulk scalar field, using a covariant formalism to obtain a 4D Einstein equation via projection onto the brane. We discuss, in detail, the effects of the bulk on the brane and how the scalar field contribute to the gravitational effects. We also discuss choice of conformal frame and show that the frame selected by the induced metric provides a natural choice. We demonstrate our formalism by applying it to cosmological scenarios of Randall-Sundrum and Horava-Witten type models. Finally we consider the cosmology of models where the scalar field couples non-minimally to the matter on the brane. This gives rise to a novel scenario where the universe expands from a finite scale factor with an initial period of accelerated expansion, thus avoiding the singularity and flatness problem of the standard big bang model.

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