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

Olindo Corradini, Massimiliano Rinaldi

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    Résumé

    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.
    langue originaleIndéfini/inconnu
    journalJournal of Cosmology and Astroparticle Physics
    Les DOIs
    Etat de la publicationPublié - 27 sept. 2005

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