Non-Singular Cosmological Models in String Gravity with Second Order Curvature Corrections

Abstract

We investigate FRW cosmological solutions in the theory of modulus field coupled to gravity through a Gauss-Bonnet term. The explicit analytical forms of nonsingular asymptotics are presented for power-law and exponentially steep modulus coupling functions. We study the influence of modulus field potential on these asymptotical regimes and find some forms of the potential which do not destroy the nonsingular behavior. In particular, we obtain that exponentially steep coupling functions arising from the string theory do not allow nonsingular past asymptotic unless modulus field potential tends to zero for modulus field $\psi \to \pm \infty$. Finally, the modification of the chaotic dynamics in the closed FRW universe due to presence of the Gauss-Bonnet term is discussed.

14 pages, 3 Postscript figures, uses epsf.sty

References in corpus (4)

• Singularity-free cosmological solutions in quadratic gravity
• String Theory, Supersymmetry, Unification, and All That
• Simplest cosmological model with the scalar field
• From Superstrings to M Theory

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• A Note on the Viability of Gauss-Bonnet Cosmology
• Non-singular Brans-Dicke cosmology with cosmological constant
• Study of symmetry in F(R) theory of gravity
• Black Holes and Naked Singularities in Low Energy Limit of String Gravity with Modulus Field
• New properties of scalar field dynamics in brane isotropic cosmological models
• Modified gravity from an entropy functional
• Certain aspects of regularity in scalar field cosmological dynamics