Physics – High Energy Physics – High Energy Physics - Lattice
Scientific paper
2005-11-24
Phys.Rev. D74 (2006) 034503
Physics
High Energy Physics
High Energy Physics - Lattice
11 pages, 12 figures. Some changes in the exposition, figures and text added. To appear on Phys. Rev. D
Scientific paper
10.1103/PhysRevD.74.034503
We reinvestigate the problem of Gribov ambiguities within the Landau (or Lorentz) gauge for the ghost and gluon propagators in pure SU(2) lattice gauge theory. We make use of the full symmetry group of the action taking into account {\it large}, i.e. non-periodic $\mathbb{Z}(2)$ gauge transformations leaving lattice plaquettes invariant. Enlarging in this way the gauge orbits for any given gauge field configuration the Landau gauge can be fixed at higher local extrema of the gauge functional in comparison with standard (overrelaxation) techniques. This has a clearly visible effect not only for the ghost propagator at small momenta but also for the gluon propagator, in contrast to the common belief.
Bogolubsky I. L.
Burgio Giuseppe
Mueller-Preussker Michael
~Mitrjushkin V. K.
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