Nonsingular Dilaton Cosmology in the String Frame

Details Nonsingular Dilaton Cosmology in the String Frame Nonsingular Dilaton Cosmology in the String Frame

1999-05-24

arxiv.org/abs/hep-th/9905175v3

JHEP 9909:003, 1999

Physics

High Energy Physics

High Energy Physics - Theory

8 pages, 3 figures, LaTex; minor changes; published in JHEP 9909:003, 1999

Scientific paper

10.1088/1126-6708/1999/09/003

We consider the theory obtained by adding to the usual string frame dilaton gravity action specially constructed higher derivative terms motivated by the limited curvature construction of [MukhanovET1992a] and determine the spatially homogeneous and isotropic solutions to the resulting equations of motion. All solutions of the resulting theory of gravity with these symmetries are nonsingular and all curvature invariants are bounded. For initial conditions inspired by the pre-big-bang scenario solutions exist which correspond to a spatially flat Universe starting in a dilaton-dominated superinflationary phase with ${\dot H} > 0$ and having a smooth transition to an expanding Friedmann Universe with ${\dot H} < 0$. Hence, the graceful exit problem of pre-big-bang cosmology is solved in a natural way.

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