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MP: Fachverband Theoretische und Mathematische Grundlagen der Physik

MP 3: Quantenfeldtheorie

MP 3.1: Talk

Tuesday, February 26, 2013, 16:30–16:55, HS 8

Gauge-fixing and the Gribov-Singer ambiguity — •Axel Maas — Institute for Theoretical Physics, University of Jena, Germany

Gauge-fixing is a useful tool in intermediate steps of calculations in quantum gauge field theories. However, in non-Abelian gauge theories it is complicated non-perturbatively by the Gribov-Singer ambiguity.

Several aspects of this ambiguity and proposals for its resolution in the class of Landau gauges will be presented, especially in view of the necessity to perform the same type of gauge-fixing both in the continuum and on the lattice. This has implications also for global residual gauge symmetries, like the BRST symmetry or the breaking of global symmetries by the Higgs mechanism.