I'm still pretty new to QFT, so forgive me if I have made a ridiculous mistake.(adsbygoogle = window.adsbygoogle || []).push({});

I've been learning QFT from Peskin and Schroeder mostly but decided to read Ryder recently and I have just come across an amazing result (in my opinion) in Chapter 3.

Ryder basically shows that the electromagnetic field and its coupling to the complex Klein Gordon Field "arises naturally by demanding invariance of the action under gauge transformation of the second kind in the internal space of the complex Klein Gordon field".

My question is, does this also hold for the Dirac Field?

By making similar demands on the Dirac Field can one derive the electromagnetic field and its coupling to the Dirac Field?

(Hopefully I haven't written this in a difficult to understand manner)

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# Learning QFT from Peskin and Schroeder

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