Magnetic monopoles with no strings attached: a portal to the dark side of dual electrodynamics

Jan Govaerts

doi:10.1140/epjc/s10052-023-11302-7

2023 Impact factor 4.2

Particles and Fields

Open Access

Eur. Phys. J. C (2023) 83: 158
https://doi.org/10.1140/epjc/s10052-023-11302-7

Regular Article - Theoretical Physics

Magnetic monopoles with no strings attached: a portal to the dark side of dual electrodynamics

Jan Govaerts¹^,2^,3^a

¹ Centre for Cosmology, Particle Physics and Phenomenology (CP3), Institut de Recherche en Mathématique et Physique (IRMP), Université catholique de Louvain (UCLouvain), 2, Chemin du Cyclotron, 1348, Louvain-la-Neuve, Belgium
² International Chair in Mathematical Physics and Applications (ICMPA-UNESCO Chair), University of Abomey-Calavi, 072 B.P. 50, Cotonou, Republic of Benin
³ Stellenbosch Institute for Advanced Study (STIAS), Stellenbosch, Republic of South Africa

^a Jan.Govaerts@uclouvain.be

Received: 22 July 2022
Accepted: 5 February 2023
Published online: 18 February 2023

Abstract

It has long been known that in the absence of electric charges and currents, Maxwell’s electromagnetism in 4 dimensional vacuum Minkowski space-time is invariant under SO(2) dual transformations that mix its electric and magnetic fields. Extending this symmetry to include the coupling to electrically charged matter, requires a dual coupling to magnetically charged matter as well, leading to Maxwell equations for SO(2) dual electrodynamics. Based on a doubled ensemble of SO(2) dual 4-vector gauge potentials which does away with the need of Dirac string singularities for magnetic monopoles, a local Lagrangian action principle for SO(2) dual electromagnetism is known, which manifestly displays all the required space-time and internal symmetries, and reduces to the experimentally well established Maxwell electrodynamics in the absence of magnetic charges and currents. Applying the same considerations for the matter action of electrically and magnetically charged point particles, a unique SO(2) dual generalised Lorentz force is identified for SO(2) dual electrodynamics, truly different from the usual SO(2) dual invariant choice motivated by simplicity, but yet made arbitrarily and which does not derive from some action principle. This generalised Lorentz force involves a single real and new coupling constant of unknown value, without the requirement of a Dirac–Schwinger–Zwanziger quantisation condition for electric and magnetic charges of dyons. A physical consequence for SO(2) dual electrodynamics of this coupling constant if nonvanishing, is to open a channel, or portal between the otherwise mutually totally “dark” sectors of electric and magnetic charges for electromagnetic interactions.

© The Author(s) 2023

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