Nonlinear Spinor Fields and its role in Cosmology

TL;DR

This paper models the universe's evolution using nonlinear spinor fields to simulate matter, revealing how anisotropy persists or diminishes in different cosmological models.

Contribution

It introduces a novel approach using nonlinear spinor fields to simulate matter effects in various anisotropic and isotropic cosmological models.

Findings

Anisotropy persists in Bianchi types VI, VI0, V, and III due to metric restrictions.

Type-I models evolve into isotropic configurations.

Spinor fields effectively simulate perfect fluid and dark energy influences.

Abstract

Different characteristic of matter influencing the evolution of the Universe has been simulated by means of a nonlinear spinor field. Exploiting the spinor description of perfect fluid and dark energy evolution of the Universe given by an anisotropic Bianchi type-VI, VI$_0$, V, III, I or isotropic Friedmann-Robertson-Walker (FRW) one has been studied. It is shown that due to some restrictions on metric functions, initial anisotropy in the models Bianchi type-VI, VI$_0$, V and III does not die away, while the anisotropic Bianchi type-I models evolves into the isotropic one.