String Propagation in Bianchi Type I models: Dynamical anisotropy Damping and Consequences

TL;DR

This paper introduces a generic ansatz for null-string solutions in Bianchi type I cosmologies, revealing how string backreaction influences anisotropy and providing analytical and numerical solutions.

Contribution

It presents a new generic ansatz for null-string solutions in Bianchi type I models and explores backreaction effects on anisotropy within dilaton cosmologies.

Findings

Exact solutions for null-string equations of motion and constraints.

Backreaction mapping relates string effects to anisotropy changes.

Analytical and numerical integration of the models.

Abstract

A generic ansatz is introduced which provides families of exact solutions to the equations of motion and constraints for null-strings in Bianchi type I cosmological models. This is achieved irrespective of the form of the metric. Within classes of dilaton cosmologies a backreaction mapping relation is established where the null string leads to more or less anisotropic members of the family. The equations of motion and constraints for the generic model are casted in their first order form and integrated both analytically and numerically.