The Graceful Exit Problem in String Cosmology

Details The Graceful Exit Problem in String Cosmology The Graceful Exit Problem in String Cosmology

1994-03-09

arxiv.org/abs/hep-th/9403060v1

Phys.Lett. B329 (1994) 429-434

Physics

High Energy Physics

High Energy Physics - Theory

13 pages,uuencoded post-script, preprint CERN-TH.7179/94

Scientific paper

10.1016/0370-2693(94)91086-3

Isotropic string cosmology solutions can be classified into two duality related branches: one can be connected smoothly to an expanding Friedman-Robertson-Walker Universe, the other describes accelerated inflation or contraction. We show that, if the dilaton potential has certain generic properties, the two branches can evolve smoothly into each other. We find, however, that just the effects of a potential do not allow for a graceful exit from accelerated inflation in the weak curvature regime. We explain how conformal field theory techniques could be used to give a decisive answer on whether graceful exit from accelerated inflation is possible at all.

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