Revisiting Gribov's Copies Inside The Horizon
  In this work, we recover the problem of legitimate topologically trivial Gribov copies inside the Gribov horizon. We avoid the reducibility problem which hampered the standard construction of van Baal, and then we are able to build a valid example with spherical symmetry. We also apply the same technique in the presence of a background of a Polyakov instanton in a Euclidian 3D spacetime, in order to study the effect of a non trivial environment in the generation of multiple copies inside the horizon. 
R. R. Landim, V. E. R. Lemes, O. S. Ventura, L. C. Q. Vilar
hep-th