On the Dirac Monopole Mass Scale

TL;DR

This paper demonstrates that Dirac charge quantization remains valid within Born-Infeld theory and introduces a method to calculate the monopole mass, leveraging the theory's upper limit on field intensities.

Contribution

It provides a novel semi-classical approach to determine Dirac monopole mass in Born-Infeld theory, unlike in Maxwell's theory.

Findings

Dirac charge quantization holds in Born-Infeld theory

Monopole mass can be calculated within this framework

Upper limit on field intensities is crucial for the proof

Abstract

It is shown, by a semi-classical argument, that the Dirac charge quantization is still valid in the (classical) Born-Infeld electromagnetic theory. Then it is possible to calculate Dirac's monopole mass in the framework of this theory, which is not possible in Maxwell's theory. The existence of an upper limit for the field intensities in this theory plays an important role in this proof.