Gribov horizon beyond the Landau gauge

Understand

Gribov and Zwanziger proposed a modification of Yang-Mills theory in order to cure the Gribov copy problem.

• We employ field-dependent BRST transformations to generalize the Gribov-Zwanziger model from the Landau gauge to general R_xi gauges.
• The Gribov horizon functional is presented in explicit form, in both the non-local and local variants.
• Finally, we show how to reach any given gauge from the Landau one.