Self-T-Dual Brane Cosmology and the Cosmological Constant Problem

Details Self-T-Dual Brane Cosmology and the Cosmological Constant Problem Self-T-Dual Brane Cosmology and the Cosmological Constant Problem

2005-09-27

arxiv.org/abs/hep-th/0509200v3

JCAP 0601 (2006) 020

Physics

High Energy Physics

High Energy Physics - Theory

Minor corrections, comments & references added. Accepted for publication

Scientific paper

10.1088/1475-7516/2006/01/020

We consider a codimension-one brane embedded in a gravity-dilaton bulk action, whose symmetries are compatible with T-duality along the space-like directions parallel to the brane, and the bulk time-like direction. The equations of motions in the string frame allow for a smooth background obtained by the union of two symmetric patches of AdS space. The Poincar\'{e} invariance of the solution appears to hold independently of the value of the brane vacuum energy, through a self-tuning property of the dilaton ground state. Moreover, the effective cosmology displays a bounce, at which the scale factor does not shrink to zero. Finally, by exploiting the T-duality symmetry, we show how to construct an ever-expanding Universe, along the lines of the Pre-Big Bang scenario.

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