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

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

1999-12-16

arxiv.org/abs/gr-qc/9912071v1

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

14 pages, 3 Postscript figures, uses epsf.sty

Scientific paper

10.1088/0264-9381/17/11/306

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.

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