Gauge symmetry is not a symmetry. It is a fake, a redundancy introduced by hand to help us keep track of massless particles in quantum field theory. All physical predictions must be gauge-independent.(adsbygoogle = window.adsbygoogle || []).push({});

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How can you prove that correlators in quantum field theoryaregauge-independent?

Must correlators necessarily havegauge-invariantoperators?

What are some examples of correlation functions withgauge-invariantoperators?

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# A Gauge-invariant operators in correlation functions

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