Nonsingular multidimensional cosmologies without fine tuning

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. © SISSA/ISAS 2002.

Authors
Bronnikov K.A. 1, 2 , Fabris J.C.3
Editors
-
Publisher
-
Number of issue
9
Language
English
Pages
1285-1298
Status
Published
Department
-
DOI
-
Number
-
Volume
6
Year
2002
Organizations
  • 1 VNIIMS, 3-1 M. Ulyanovoy St., Moscow 117313, Russian Federation
  • 2 Institute of Gravitation and Cosmology, RUDN, 6 Miklukho-Maklaya St., Moscow 117198, Russian Federation
  • 3 Departamento de Física, Universidade Federal do Espírito Santo, CEP29060-900, Espirito Santo, Brazil
Keywords
Classical Theories of Gravity; Cosmology of Theories beyond the SM; P-branes; Physics of the Early Universe
Date of creation
19.10.2018
Date of change
19.10.2018
Short link
https://repository.rudn.ru/en/records/article/record/174/