Cosmological Evolution in a Type-0 String Theory

Details Cosmological Evolution in a Type-0 String Theory Cosmological Evolution in a Type-0 String Theory

2001-07-13

arxiv.org/abs/hep-th/0107124v1

Int.J.Mod.Phys. A17 (2002) 2241-2266

Physics

High Energy Physics

High Energy Physics - Theory

33 pages LATEX, seven eps figures incorporated

Scientific paper

10.1142/S0217751X02010534

We study the cosmological evolution of a type-0 string theory by employing non-criticality, which may be induced by fluctuations of the D3 brane worlds. We check the consistency of the approach to O(alpha ') in the corresponding sigma-model. The ten-dimensional theory is reduced to an effective four-dimensional model, with only time dependent fields. We show that the four-dimensional universe has an inflationary phase and graceful exit from it, while the other extra dimensions are stabilized to a constant value, with the fifth dimension much larger than the others. We pay particular attention to demonstrating the role of tachyonic matter in inducing these features. The Universe asymptotes, for large times, to a non-accelerating linearly-expanding Universe with a time-dependent dilaton and a relaxing to zero vacuum energy a la quintessence.

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