Gauge invariance of massless QED
classification
✦ hep-ph
hep-th
keywords
gaugeinvariancecausalframeworkgeneralgivenillustratesmassless
read the original abstract
A simple general proof of gauge invariance in QED is given in the framework of causal perturbation theory. It illustrates a method which can also be used in non-abelian gauge theories.
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