Graceful Exit and Energy Conditions in String Cosmology

Details Graceful Exit and Energy Conditions in String Cosmology Graceful Exit and Energy Conditions in String Cosmology

1997-02-05

arxiv.org/abs/hep-th/9702043v1

Phys.Lett. B410 (1997) 110-118

Physics

High Energy Physics

High Energy Physics - Theory

16 pages, 2 eps figures, Latex

Scientific paper

10.1016/S0370-2693(97)00945-3

String cosmology solutions are examined in a generalized phase-space including sources representing arbitrary corrections to lowest order string-dilaton-gravity effective action. We find a set of necessary conditions for a graceful exit transition from a dilaton-driven inflationary phase to a radiation dominated era. We show that sources allowing such a transition have to violate energy conditions similar to those appearing in singularity theorems of general relativity. Since familiar classical sources, excepting spatial curvature, obey these energy conditions we conclude that a generic graceful exit in string cosmology requires a new effective phase of matter. Our results clarify and generalize previous analyses and enable us to critically reexamine proposed non-singular cosmologies.

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