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T: Fachverband Teilchenphysik
T 83: Quantenfeldtheorie 1
T 83.8: Gruppenbericht
Mittwoch, 26. März 2014, 18:30–18:50, P15
On the analytic structure of propagators in Landau gauge QCD — Reinhard Alkofer1, Christian Fischer2, Markus Q. Huber3, and •Andreas Windisch1 — 1Institut fuer Physik, Karl-Franzens Universitaet Graz, Universitaetsplatz 5, 8010 Graz, Austria — 2Institut fuer Theoretische Physik, Justus-Liebig Universitaet Giessen, 35392 Giessen, Germany — 3Institut fuer Kernphysik, Technische Universitaet Darmstadt, Schlossgartenstrasse 2, 64289 Darmstadt, Germany
The analytic structure of Green's functions holds valuable information on the propagating degree of freedom. In particular, the notion of positivity violation of spectral densities establishes a sufficient (though not necessary) criterion to expel the degree of freedom from the space of asymptotic states, serving thus as a simple mechanism of confinement. Here we discuss methods of calculating the analytic properties of the non-perturbative Landau gauge quark propagator by means of Dyson-Schwinger equations.