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splur
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Can someone provide a qualitative description of how electromagnetic fields behave differently when one uses the Proca equations rather than Maxwells equations? That is, if I start with a nice classical EM problem like a plane wave, a moving charge, or an antenna, and then I gradually increase the mass of the photon (perhaps to something very large), what should I expect to happen? This is more of a thought experiment, I'm not concerned with the physical reality of it.