Graceful exit in quantum string cosmology

Details Graceful exit in quantum string cosmology Graceful exit in quantum string cosmology

1996-02-16

arxiv.org/abs/hep-th/9602087v1

Nucl.Phys. B472 (1996) 349-360

Physics

High Energy Physics

High Energy Physics - Theory

16 pages, LATEX. A complete collection of papers and references on the pre-big-bang scenario in string cosmology is available

Scientific paper

10.1016/0550-3213(96)00201-5

We write an O(d,d)-covariant Wheeler-De Witt equation in the ($d^2+1$)-dimensional minisuperspace of low-energy cosmological string backgrounds. We discuss explicit examples of transitions between two duality-related cosmological phases, and we find a finite quantum transition probability even when the two phases are classically separated by a curvature singularity. This quantum approach is completely free from operator ordering ambiguities as a consequence of the duality symmetries of the string effective action.

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