Asymptotic Behaviour of Inhomogeneous String Cosmologies

TL;DR

This paper analyzes the late-time evolution of inhomogeneous axion-dilaton cosmologies with specific symmetries, revealing their tendency towards anisotropic universes with gravitational radiation and peeling-off behavior of key tensors.

Contribution

It provides new insights into the asymptotic behavior of inhomogeneous string cosmologies with two spacelike Killing vectors, connecting to pre-big-bang scenarios.

Findings

Universes evolve towards anisotropic states with gravitational radiation.

Weyl tensor and antisymmetric tensor field strength exhibit peeling-off behavior.

The study links asymptotic cosmology to string theory pre-big-bang models.

Abstract

The asymptotic behaviour at late times of inhomogeneous axion-dilaton cosmologies is investigated. The space-times considered here admit two abelian space-like Killing vectors. These space-times evolve towards an anisotropic universe containing gravitational radiation. Furthermore, a peeling-off behaviour of the Weyl tensor and the antisymmetric tensor field strength is found. The relation to the pre-big-bang scenario is briefly discussed.