Nonsingular and accelerated expanding universe from effective Yang-Mills theory

TL;DR

This paper investigates how effective Yang-Mills theory can produce a nonsingular, accelerated expanding universe, potentially explaining inflation through a vector field in early cosmology.

Contribution

It demonstrates that certain solutions from effective Yang-Mills theory can lead to nonsingular, accelerated universe models, offering a new mechanism for early universe inflation.

Findings

Open models allow accelerated expansion.

Some solutions are nonsingular.

Models depend on parameter values.

Abstract

The energy-momentum tensor coming from one-parameter effective Yang- Mills theory is here used to describe the matter-energy content of the homogeneous and isotropic Friedmann cosmology in its early stages. The behavior of all solutions is examined. Particularly, it is shown that only solutions corresponding to an open model allow the universe to evolve into an accelerated expansion. This result appears as a possible mechanism for an inflationary phase produced by a vector field. Further, depending on the value of some parameters characterizing the system, the resulting models are classified as singular or nonsingular.