Nonsingular multidimensional cosmologies without fine tuning

Details Nonsingular multidimensional cosmologies without fine tuning Nonsingular multidimensional cosmologies without fine tuning

2002-07-23

arxiv.org/abs/hep-th/0207213v1

JHEP 0209 (2002) 062

Physics

High Energy Physics

High Energy Physics - Theory

Latex 2e, 9 pages

Scientific paper

10.1088/1126-6708/2002/09/062

Exact cosmological solutions for effective actions in D dimensions inspired by the tree-level superstring action are studied. For a certain range of free parameters existing in the model, nonsingular bouncing solutions are found. Among them, of particular interest can be open hyperbolic models, in which, without any fine tuning, the internal scale factor and the dilaton field (connected with string coupling in string theories) tend to constant values at late times. A cosmological singularity is avoided due to nonminimal dilaton-gravity coupling and, for D > 11, due to pure imaginary nature of the dilaton, which conforms to currently discussed unification models. The existence of such and similar solutions supports the opinion that the Universe had never undergone a stage driven by full-scale quantum gravity.

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