Improved Landau gauge fixing and the suppression of finitevolume effects of the lattice gluon propagator
Abstract
For the gluon propagator of pure SU(2) lattice gauge theory in the Landau gauge we investigate the effect of Gribov copies and finitevolume effects. Concerning gauge fixing, we enlarge the accessible gauge orbits by adding nonperiodic Z(2) gauge transformations and systematically employ the simulated annealing algorithm. Strategies to keep all Z(2) sectors under control within reasonable CPU time are discussed. We demonstrate that the finitevolume effects in the infrared regime become ameliorated. Reaching a physical volume of about (6.5fm)^{4}, we find that the propagator, calculated with the indicated improvements, becomes flat in the region of smallest momenta. There are first signs in four dimensions of a decrease towards vanishing momentum.
 Publication:

Physical Review D
 Pub Date:
 January 2008
 DOI:
 10.1103/PhysRevD.77.014504
 arXiv:
 arXiv:0707.3611
 Bibcode:
 2008PhRvD..77a4504B
 Keywords:

 11.15.Ha;
 12.38.Aw;
 12.38.Gc;
 Lattice gauge theory;
 General properties of QCD;
 Lattice QCD calculations;
 High Energy Physics  Lattice
 EPrint:
 10 pages, 4 figures, changes to match the journal version and the Erratum