What does it mean for a gauge to be a physical gauge in your gauge choice of the theory, and why is it called the "physical gauge"?
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1$\begingroup$ No gauge choice is more physical than any other. That's the fundamental principle of gauge theories, and I have never heard the term "physical gauge". Can you add to your question in which context you have seen this terminology? $\endgroup$– ACuriousMind ♦Mar 27, 2016 at 20:02
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Physical gauge presumably refers to unitary gauge, where Faddeev-Popov ghosts and other unphysical degrees of freedom decouple from the theory.
answered Mar 27, 2016 at 20:18