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Aug10-11, 11:43 PM
jtbell's Avatar
P: 11,748
If you're prepared to move beyond classical electrodynamics to quantum electrodynamics, postulating that particle (e.g. electron) fields have local U(1) gauge symmetry requires the existence of a "new" field that has exactly the properties of the electromagnetic (photon) field. See for example

The Quantum Physics forum here is probably a better place to pursue this train of thought.