Towards a Stringy Resolution of the Cosmological Singularity

Details Towards a Stringy Resolution of the Cosmological Singularity Towards a Stringy Resolution of the Cosmological Singularity

2003-04-19

arxiv.org/abs/hep-th/0304168v3

Phys.Rev. D68 (2003) 043514

Physics

High Energy Physics

High Energy Physics - Theory

6 pages, 2 Figures; minor revisions; references added; REVTeX 4; version to appear in Phys. Rev. D

Scientific paper

10.1103/PhysRevD.68.043514

We study cosmological solutions to the low-energy effective action of heterotic string theory including possible leading order $\alpha'$ corrections and a potential for the dilaton. We consider the possibility that including such stringy corrections can resolve the initial cosmological singularity. Since the exact form of these corrections is not known the higher-derivative terms are constructed so that they vanish when the metric is de Sitter spacetime. The constructed terms are compatible with known restrictions from scattering amplitude and string worldsheet beta-function calculations. Analytic and numerical techniques are used to construct a singularity-free cosmological solution. At late times and low-curvatures the metric is asymptotically Minkowski and the dilaton is frozen. In the high-curvature regime the universe enters a de Sitter phase.

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