Lattice results on gluon and ghost propagators in Landau gauge

Abstract

We present clear evidence of strong effects of Gribov copies in Landau gauge gluon and ghost propagators computed on the lattice at small momenta by employing a new approach to Landau gauge fixing and a more effective numerical algorithm. It is further shown that the new approach substantially decreases notorious finite-volume effects.

Comments: 5 pages, 2 figures, contribution to Proceedings of the 13th Lomonosov Conference on Elementary Particle Physics, Moscow, August 2007