Towards A Nonsingular Tachyonic Big Crunch

Details Towards A Nonsingular Tachyonic Big Crunch Towards A Nonsingular Tachyonic Big Crunch

2007-05-22

arxiv.org/abs/0705.3265v2

Phys.Rev.D76:063502,2007

Physics

High Energy Physics

High Energy Physics - Theory

7 pages, two references added

Scientific paper

10.1103/PhysRevD.76.063502

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.

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