Electromagnetic duality and central charge

@article{Freidel2018ElectromagneticDA,
  title={Electromagnetic duality and central charge},
  author={Laurent Freidel and Daniele Pranzetti},
  journal={Physical Review D},
  year={2018}
}
We provide a full realization of the electromagnetic duality at the boundary by extending the phase space of Maxwell's theory through the introduction of edge modes and their conjugate momenta. We show how such extension, which follows from a boundary action, is necessary in order to have well defined canonical generators of the boundary magnetic symmetries. In this way, both electric and magnetic soft modes are encoded in a boundary gauge field and its conjugate dual. This implementation of… 
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