Bianchi Type I Cosmologies in Arbitrary Dimensional Dilaton Gravities

Details Bianchi Type I Cosmologies in Arbitrary Dimensional Dilaton Gravities Bianchi Type I Cosmologies in Arbitrary Dimensional Dilaton Gravities

2000-04-13

arxiv.org/abs/hep-th/0004096v1

Phys.Rev. D62 (2000) 124016

Physics

High Energy Physics

High Energy Physics - Theory

REVTEX, 10 pages, 8 figures

Scientific paper

10.1103/PhysRevD.62.124016

We study the low energy string effective action with an exponential type dilaton potential and vanishing torsion in a Bianchi type I space-time geometry. In the Einstein and string frames the general solution of the gravitational field equations can be expressed in an exact parametric form. Depending on the values of some parameters the obtained cosmological models can be generically divided into three classes, leading to both singular and nonsingular behaviors. The effect of the potential on the time evolution of the mean anisotropy parameter is also considered in detail, and it is shown that a Bianchi type I Universe isotropizes only in the presence of a dilaton field potential or a central deficit charge.

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