Berlin 2005 – wissenschaftliches Programm

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T: Teilchenphysik

T 707: QCD III

T 707.6: Vortrag

Mittwoch, 9. März 2005, 15:15–15:30, TU H2037

Center vortices and Dirac eigenmodes in SU(2) lattice gauge theory — •Torsten Tok¹, Jochen Gattnar¹, Christof Gattringer², Kurt Langfeld¹, Hugo Reinhardt¹, Andreas Schäfer², and Stefan Solbrig² — ¹Institut für Theoretische Physik, Universität Tübingen, 72076 Tübingen — ²Institut für Theoretische Physik, Universität Regensburg, 93040 Regensburg

We study the interplay between Dirac eigenmodes and center vortices in SU(2) lattice gauge theory. In particular we focus on vortex-removed configurations and compare them to an ensemble of configurations with random changes of the link variables. We show that removing the vortices destroys all zero modes and the near zero modes are no longer coupled to topological structures. The Dirac spectrum for vortex-removed configurations in many respects resembles a free spectrum thus leading to a vanishing chiral condensate. Configurations with random changes leave the topological features of the Dirac eigensystem intact.