Regular bouncing cosmological solutions in effective actions in four dimensions - art. no. 043503

Citation
Cp. Constantinidis et al., Regular bouncing cosmological solutions in effective actions in four dimensions - art. no. 043503, PHYS REV D, 6104(4), 2000, pp. 3503
Citations number
20
Categorie Soggetti
Physics
Journal title
PHYSICAL REVIEW D
ISSN journal
05562821 → ACNP
Volume
6104
Issue
4
Year of publication
2000
Database
ISI
SICI code
0556-2821(20000215)6104:4<3503:RBCSIE>2.0.ZU;2-K
Abstract
We study cosmological scenarios resulting from effective actions in four di mensions which are, under some assumptions, connected with multidimensional , supergravity and string theories. These effective actions are labeled by the parameters omega, the dilaton coupling constant, and n which establishe s the coupling between the dilaton and a scalar field originating from the gauge field existing in the original theories. There is a large class of bo uncing as well as Friedmann-like solutions. We investigate under which cond itions bouncing regular solutions can be obtained. In the case of the strin g effective action, regularity is obtained through the inclusion of contrib utions from the Ramond-Ramond sector of superstring.