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May 17, 2020 at 9:02 vote accept Ryan Parikh
May 17, 2020 at 8:48 comment added Davide Morgante @RyanParikh If you take a look at the paper i gave you, you'll find the answer since they consider the interaction coupling between the field $A_\mu^A$ and the charges $Q^A$.
May 17, 2020 at 8:43 comment added Ryan Parikh What happens if you include currents in the lagrangian?
May 17, 2020 at 8:27 history answered Davide Morgante CC BY-SA 4.0