Back Reaction and Graceful Exit in String Inflationary Cosmology

Details Back Reaction and Graceful Exit in String Inflationary Cosmology Back Reaction and Graceful Exit in String Inflationary Cosmology

1996-05-23

arxiv.org/abs/hep-th/9605176v1

Phys.Rev.Lett. 77 (1996) 1929-1932

Physics

High Energy Physics

High Energy Physics - Theory

12 pages, ReVTeX

Scientific paper

10.1103/PhysRevLett.77.1929

Classical string cosmology consists of two branches related to each other by scale-factor duality: a super-inflation branch and a Friedmann-Robertson-Walker (FRW) branch. Curvature and string coupling singularity separates the two branches, hence posing `graceful exit problem' to super-inflationary string cosmology. In an exactly soluble two-dimensional compactification model it is shown that quantum back reaction retards curvature and string coupling growth and connects the super-inflation branch to the FRW branch without encountering a singularity. This may offer an attractive solution to the `graceful exit problem' in string inflationary cosmology.

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