Pure Gauge
A pure gauge is the set of field configurations obtained by a gauge transformation on the null field configuration. So it is a particular "gauge orbit" in the field configuration's space.
In the abelian case, where, the pure gauge is the set of field configurations for all f(x).
Read more about this topic: Regauging
Famous quotes containing the word pure:
“To conceive the good, in fact, is not sufficient; it must be made to succeed among men. To accomplish this, less pure paths must be followed.”
—Ernest Renan (1823–1892)