Bianchi type-I model with cosmic string in the presence of a magnetic field: spinor description

TL;DR

This paper models an anisotropic Bianchi type-I universe with cosmic strings and magnetic fields using a nonlinear spinor field, demonstrating nonsingular evolution without isotropization.

Contribution

It introduces a spinor field approach to simulate cosmic strings in Bianchi type-I models, avoiding additional assumptions and analyzing singularity and anisotropy.

Findings

The model remains nonsingular throughout evolution.

The universe does not become isotropic over time.

Spinor fields effectively simulate cosmic string effects.

Abstract

A Bianchi type-I cosmological model in the presence of a magnetic flux along a cosmic string is investigated. A nonlinear spinor field is used to simulate the cosmological cloud of strings. It is shown that the spinor field simulation offer the possibility to solve the system of Einstein's equation without any additional assumptions. It is shown that the present model is nonsingular at the end of the evolution and does not allow the anisotropic Universe to turn into an isotropic one.