Bianchi Type I Cosmology in N=2, D=5 Supergravity

TL;DR

This paper explores anisotropic Bianchi type I cosmologies within a reduced N=2, D=5 supergravity framework, providing exact solutions that reveal singular behaviors and non-inflationary evolution in these models.

Contribution

It derives exact parametric solutions for Bianchi type I cosmologies in a specific supergravity context, highlighting their singular and anisotropic nature.

Findings

All solutions exhibit singularities at initial or final times.

Most models describe anisotropic, expanding or collapsing universes.

The models do not support inflationary behavior.

Abstract

The dynamics and evolution of Bianchi type I space-times is considered in the framework of the four-dimensional truncation of a reduced theory obtained from the N=2,D=5 supergravity. The general solution of the gravitational field equations can be represented in an exact parametric form. All solutions have a singular behavior at the initial/final moment, except when the space-time geometry reduces to the isotropic flat case. Generically the obtained cosmological models describe an anisotropic, expanding or collapsing, singular Universe with a non-inflationary evolution for all times.