Nonlinear Electromagnetic Fields As a Source of Universe Acceleration

TL;DR

This paper proposes a nonlinear electromagnetic field model with a parameter constrained by experiments, showing it can drive universe acceleration and align with cosmological observations.

Contribution

It introduces a nonlinear electromagnetic field model coupled with gravity that explains universe acceleration and matches observational data.

Findings

Universe accelerates due to nonlinear electromagnetic fields.

Model parameters are constrained by PVLAS experiment.

Predicted spectral index and tensor-to-scalar ratio agree with Planck, WMAP, BICEP2.

Abstract

A model of nonlinear electromagnetic fields with a dimensional parameter $\beta$ is proposed. From PVLAS experiment the bound on the parameter $\beta$ was obtained. Electromagnetic fields are coupled with the gravitation field and we show that the universe accelerates due to nonlinear electromagnetic fields. The magnetic universe is considered and the stochastic magnetic field is a background. After inflation the universe decelerates and approaches to the radiation era. The range of the scale factor, when the causality of the model and a classical stability take place, was obtained. The spectral index, the tensor-to-scalar ratio, and the running of the spectral index were estimated which are in approximate agreement with the PLANCK, WMAP, and BICEP2 data.