Damped Electromagnetic fluctuations in the early universe?

TL;DR

This paper investigates how quantum effects influence the evolution of magnetic fields in the early universe, suggesting they decay exponentially during the radiation era due to dissipation and vacuum polarization.

Contribution

It provides a theoretical analysis of quantum effects on magnetic field decay during and after inflation in the early universe.

Findings

Magnetic fields decay exponentially in the radiation era

Quantum effects like vacuum polarization contribute to magnetic field dissipation

Ohmic dissipation plays a significant role in the decay process

Abstract

This short note considers the effects of quantum theory on the linear evolution of the magnetic fields during and after inflation. The analysis appears to show that the magnetic fields decay exponentially in the high-temperature radiation era due to a combination of ohmic dissipation and vacuum polarisation.