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T: Fachverband Teilchenphysik

T 25: Gittereichtheorie I

T 25.9: Vortrag

Montag, 15. März 2010, 18:50–19:05, HG XIII

Confinement and infrared propagators in lattice Landau gauge — Axel Maas¹, Jan Martin Pawlowski^2,3, •Daniel Spielmann^2,3, Ion-Olimpiu Stamatescu², André Sternbeck⁴, and Lorenz von Smekal⁵ — ¹Institut für Physik, Universität Graz — ²Institut für Theoretische Physik, Universität Heidelberg — ³ExtreMe Matter Institute EMMI, GSI Helmholtzzentrum für Schwerionenforschung, Darmstadt — ⁴Institut für Theoretische Physik, Universität Regensburg — ⁵Institut für Kernphysik, Technische Universität Darmstadt

The mechanism of confinement in QCD can be extracted from the infrared behavior of the Landau gauge ghost and gluon propagators. Functional continuum methods find a one-parameter family of solutions, which may be related to the resolution of the Gribov ambiguity of the chosen gauge copy on the lattice.

We investigate SU(2) Yang-Mills theory on the lattice in two, three and four dimensions. In the strong-coupling limit, we find a huge effect of the Gribov ambiguity. We also study stochastic gauge fixing as an alternative to standard gauge fixing methods.