On the self-consistence of electrodynamics in the early universe

TL;DR

This paper explores a semi-classical model of electrodynamics coupled with gravity in the early universe, revealing a bouncing behavior due to quantum effects like vacuum polarization, which could have significant cosmological implications.

Contribution

It introduces a simplified semi-classical model incorporating vacuum polarization effects, demonstrating a bouncing universe scenario in the early cosmological context.

Findings

Bouncing behavior of the universe due to quantum effects

Vacuum polarization influences early universe dynamics

Semi-classical approach simplifies Maxwell-Einstein equations

Abstract

The issue of a self-consistent solution of Maxwell-Einstein equations achieves a very simple form when all quantum effects are neglected but a weak vacuum polarization due to an external magnetic field is taken into account. From a semi-classical point of view this means to deal with an appropriate limit of the one-loop effective Lagrangian for electrodynamics. When the corresponding stress-energy tensor is considered as a source of the gravitational field a surprisingly bouncing behavior is obtained. The present toy model leads to important new features which should have taken place in the early universe.