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:
“We are not naïve enough to ask for pure men; we ask merely for men whose impurity does not conflict with the obligations of their job.”
—Jean Rostand (1894–1977)