On practical problems to compute the ghost propagator in SU(2) lattice gauge theory
T. D. Bakeev, E. -M. Ilgenfritz, V. K. Mitrjushkin, M. Mueller-Preussker
Abstract
In SU(2) lattice pure gauge theory we study numerically the dependence of the ghost propagator G(p) on the choice of Gribov copies in Lorentz (or Landau) gauge. We find that the effect of Gribov copies is essential in the scaling window region, however, it tends to decrease with increasing beta. On the other hand, we find that at larger beta-values very strong fluctuations appear which can make problematic the calculation of the ghost propagator.
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