Gribov Copies in the Minimal Landau Gauge: the Influence on Gluon and Ghost Propagators
arXiv:hep-lat/9705005 · doi:10.1016/S0550-3213(97)00629-9
Abstract
We study the influence of Gribov copies on gluon and ghost propagators, evaluated numerically in pure SU(2) lattice gauge theory in the minimal Landau gauge. Simulations are done at four different values of (namely = 0, 0.8, 1.6 and 2.7) and for volumes up to (up to at = 1.6). For the gluon propagator, Gribov noise seems to be of the order of magnitude of the numerical accuracy, even at very small values of the coupling . On the contrary, for the ghost propagator, Gribov noise is clearly observable for the three values of in the strong-coupling regime. In particular, data corresponding to the minimal Landau gauge are always smaller than those obtained in a generic Landau gauge. This result can be qualitatively explained.
19 pages, including three figures; minor modifications following referee's suggestions. ZiF-MS-16/97 preprint. To appear in Nucl.Phys.B
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