Qualitative Analysis of String Cosmologies

TL;DR

This paper provides a qualitative analysis of string cosmologies considering various fields and effects, highlighting the impact of the central charge deficit on the dynamics, applicable to both isotropic and anisotropic models.

Contribution

It offers a novel qualitative framework for understanding the dynamics of string-derived cosmologies with multiple fields and effects, including the central charge deficit.

Findings

Central charge deficit significantly influences cosmological dynamics

Analysis applies to both isotropic and anisotropic Bianchi type I models

Provides insights into the qualitative behavior of string cosmologies

Abstract

A qualitative analysis is presented for spatially flat, isotropic and homogeneous cosmologies derived from the string effective action when the combined effects of a dilaton, modulus, two-form potential and central charge deficit are included. The latter has significant effects on the qualitative dynamics. The analysis is also directly applicable to the anisotropic Bianchi type I cosmology.