Electromagnetic Duality Symmetry and Helicity Conservation for the Macroscopic Maxwell’s Equations
Electromagnetic Duality Symmetry and Helicity Conservation for the Macroscopic Maxwell’s Equations
In this Letter, we show that the electromagnetic duality symmetry, broken in the microscopic Maxwell's equations by the presence of charges, can be restored for the macroscopic Maxwell's equations. The restoration of this symmetry is shown to be independent of the geometry of the problem. These results provide a tool …