Asymptotic singular behaviour of inhomogeneous cosmologies in Einstein-Maxwell-dilaton-axion theory

TL;DR

This paper investigates exact inhomogeneous cosmological solutions within a string theory-inspired model, revealing that these solutions exhibit AVTD singularities in their asymptotic limits, enhancing understanding of early universe behaviors.

Contribution

It provides explicit analysis of Einstein-Rosen solutions in Einstein-Maxwell-dilaton-axion theory, demonstrating their asymptotic velocity-term dominated singularities, a novel insight into string-inspired cosmologies.

Findings

Solutions have AVTD singularities asymptotically

Explicit asymptotic analysis of Einstein-Rosen solutions

Insights into inhomogeneous cosmologies in string theory

Abstract

We present the study of exact inhomogeneous cosmological solutions to a four-dimensional low energy limit of string theory containing non-minimal interacting electromagnetic, dilaton and axion fields. We analyze Einstein-Rosen solutions of Einstein-Maxwell-dilaton-axion equations and show, by explicitly taken the asymptotic limits, that they have asymptotically velocity-term dominated (AVTD) singularities.