Inhomogeneous Einstein-Rosen String Cosmology

TL;DR

This paper derives new inhomogeneous string cosmology models with dilaton and axion fields, exploring their properties and asymptotic behaviour, extending known homogeneous solutions to more complex inhomogeneous cases.

Contribution

It introduces two classes of exact inhomogeneous solutions generalizing Bianchi type VI_h cosmologies using string theory symmetries.

Findings

Exact inhomogeneous solutions found

Models exhibit specific asymptotic behaviour

Extensions of known homogeneous cosmologies

Abstract

Families of anisotropic and inhomogeneous string cosmologies containing non-trivial dilaton and axion fields are derived by applying the global symmetries of the string effective action to a generalized Einstein-Rosen metric. The models exhibit a two-dimensional group of Abelian isometries. In particular, two classes of exact solutions are found that represent inhomogeneous generalizations of the Bianchi type VI_h cosmology. The asymptotic behaviour of the solutions is investigated and further applications are briefly discussed.