Regular Bouncing Cosmological Solutions in Effective Actions in Four Dimensions

Abstract

We study cosmological scenarios resulting from effective actions in four dimensions 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 establishes the coupling between the dilaton and a scalar field originated from the gauge field existing in the original theories. There is a large class of bouncing as well as Friedmann-like solutions. We investigate under which conditions bouncing regular solutions can be obtained. In the case of the string effective action, regularity is obtained through the inclusion of contributions from the Ramond-Ramond sector of superstring.

Latex file, 10 pages, no figure

References in corpus (5)

• Introduction to Superstring Theory
• Minimal conditions for the creation of a Friedman-Robertson-Walker universe from a "bounce"
• Conformal transformations in classical gravitational theories and in cosmology
• String Cosmology
• Birth of the Universe in string cosmology

Cited by in corpus (8)

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• Construction of nonsingular cosmological solutions in string theories
• General solution for scalar perturbations in bouncing cosmologies
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• Classical analogous of quantum cosmological perfect fluid models
• Nonsingular multidimensional cosmologies without fine tuning
• Falsifying Tree Level String Motivated Bouncing Cosmologies