Back reaction and graceful exit in string inflationary cosmology
May, 199612 pages
Published in:
- Phys.Rev.Lett. 77 (1996) 1929-1932
e-Print:
- hep-th/9605176 [hep-th]
Report number:
- SNUTP-96-043
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Abstract:
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.- inflation
- string model
- effect: back reaction
- compactification
- dimension: 2
- Friedman model
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