Universe acceleration and nonlinear electrodynamics

TL;DR

This paper introduces a nonlinear electrodynamics model coupled with gravity, showing it can cause accelerated universe expansion driven by magnetic fields, with implications for inflation and stability.

Contribution

It presents a novel nonlinear electrodynamics model that explains universe acceleration through magnetic fields, including analysis of causality and stability.

Findings

Universe undergoes inflation and acceleration driven by magnetic fields

Model demonstrates causality and classical stability during deceleration phase

Universe asymptotically approaches Minkowski spacetime after expansion

Abstract

A new model of nonlinear electrodynamics with a dimensional parameter $\beta$ coupled to gravity is considered. We show that an accelerated expansion of the universe takes place if the nonlinear electromagnetic field is the source of the gravitational field. A pure magnetic universe is investigated and the magnetic field drives the universe to accelerate. In this model, after the big bang, the universe undergoes inflation, and the accelerated expansion and then decelerates approaching Minkowski spacetime asymptotically. We demonstrate the causality of the model and a classical stability at the deceleration phase.