We summarize different uses of the eigenmodes of the Neuberger overlap operator for the analysis of the QCD vacuum, here applied to quenched configurations simulated by means of the Luescher-Weisz action. We describe the localization and chiral properties of the lowest modes. The overlap-based topological charge density (with and without UV-filtering) is compared with the results of UV-filtering for the field strength tensor. The latter allows to identify domains of good (anti-)selfduality. All these techniques together lead to a dual picture of the vacuum, unifying the infrared instanton picture with the presence of singular defects co-existent at different scales.
@article{arxiv.hep-lat/0610087,
title = {The QCD vacuum probed by overlap fermions},
author = {V. Weinberg and E. -M. Ilgenfritz and K. Koller and Y. Koma and G. Schierholz and T. Streuer},
journal= {arXiv preprint arXiv:hep-lat/0610087},
year = {2008}
}
Comments
7 pages, 4 figures, talk presented at the XXIVth International Symposium on Lattice Field Theory, 23-28 July 2006, Tucson, Arizona, USA