Vacuum structure as seen by overlap fermions

Abstract

Three complementary views on the QCD vacuum structure, all based on eigenmodes of the overlap operator, are reported in their interrelation: (i) spectral density, localization and chiral properties of the modes, (ii) the possibility of filtering the field strength with the aim to detect selfdual and antiselfdual domains and (iii) the various faces of the topological charge density, with and without a cutoff λ_{\rm cut} = O(Λ_{QCD}). The techniques are tested on quenched SU(3) configurations.

4 pages, 3 figures, talk given by E.-M. I. at "Quark Confinement and the Hadron Spectrum VII", Ponta Delgada, Azores, Portugal, to appear in the Proceedings