Towards A Nonsingular Tachyonic Big Crunch

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We discuss an effective field theory background containing the gravitational field, the dilaton and a closed string tachyon, and couple this background to a gas of fundamental strings and D strings. Allowing for the possibility of a non-vanishing dilaton potential of Casimir type, we demonstrate the possibility of obtaining a nonsingular, static tachyon condensate phase with fixed dilaton. The time reversal of our solution provides a candidate effective field theory description of a Hagedorn phase of string gas cosmology with fixed dilaton.
7 pages, two references added

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High Energy Physics - Theory, Astrophysics, General Relativity and Quantum Cosmology, High Energy Physics - Phenomenology

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http://salesiana.dossiersoluciones.com/handle/123456789/192621

Consulte el texto completo en el siguiente enlace:

https://arxiv.org/abs/0705.3265
 http://arxiv.org/abs/0705.3265
 Phys.Rev.D76:063502,2007
 doi:10.1103/PhysRevD.76.063502

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arXiv