Effects of anisotropy and spatial curvature on the pre-big bang scenario

Details Effects of anisotropy and spatial curvature on the pre-big bang scenario Effects of anisotropy and spatial curvature on the pre-big bang scenario

1998-02-19

arxiv.org/abs/gr-qc/9802052v1

Phys.Rev. D58 (1998) 044017

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

15 pages, including 2 eps figures

Scientific paper

10.1103/PhysRevD.58.044017

A class of exact, anisotropic cosmological solutions to the vacuum Brans-Dicke theory of gravity is considered within the context of the pre-big bang scenario. Included in this class are the Bianchi type III, V and VI_h models and the spatially isotropic, negatively curved Friedmann-Robertson-Walker universe. The effects of large anisotropy and spatial curvature are determined. In contrast to negatively curved Friedmann-Robertson-Walker model, there exist regions of the parameter space in which the combined effects of curvature and anisotropy prevent the occurrence of inflation. When inflation is possible, the necessary and sufficient conditions for successful pre-big bang inflation are more stringent than in the isotropic models. The initial state for these models is established and corresponds in general to a gravitational plane wave.

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