Showing papers by "Manfried Faber published in 2020"
01 Jan 2020
TL;DR: The center vortex model of the QCD vacuum is very successful in explaining the nonperturbative properties of QCD, especially confinement, chiral symmetry breaking and the topological charge of vacuum configurations.
Abstract: The center vortex model of the QCD vacuum is very successful in explaining the non-perturbative properties of QCD, especially confinement, chiral symmetry breaking and the topological charge of vacuum configurations. On the other hand, the center vortex model still suffers from a Gribov problem: Direct maximal center gauge and center projection can lead to an underestimation of the string tension in smooth configurations or after persistent simulated annealing. We discuss methods to identify center regions, whose boundaries evaluate to center elements, and want to improve the vortex detection: these regions might help to recognize vortices in configurations where maximal center gauge lost the vortex finding property.
11 citations
22 May 2020
TL;DR: In this article, a vanishing thickness of center vortices in the continuum limit and hints at their color structure were obtained for SU(2) quantum chromodynamic with lattice simulations using Wilson action.
Abstract: In search for an effective model of quark confinement we study the vacuum of SU(2) quantum chromodynamic with lattice simulations using Wilson action. Assuming that center vortices are the relevant excitations causing confinement, we analyzed their physical size and their color structure. We present confirmations for a vanishing thickness of center vortices in the continuum limit and hints at their color structure. This is the first time that algorithms for the detection of thick center vortices based on non-trivial center regions has been used.
4 citations
TL;DR: In this article, the authors studied the topological properties of spherical center vortices with the low-lying eigenmodes of the Dirac operator in the fundamental and adjoint representations using both the overlap and overlap.
Abstract: We study topological properties of classical spherical center vortices with the low-lying eigenmodes of the Dirac operator in the fundamental and adjoint representations using both the overlap and ...
4 citations
TL;DR: The relation between center vortices and fractional topological charge has been studied in this paper, where the lowest modes of the adjoint Dirac operator were analyzed in both overlap and staggered formulations.
Abstract: The relation between center vortices and fractional topological charge has been studied in this work Specifically, we investigate a vortex configuration with fractional topological charge analyzing the lowest modes of the adjoint Dirac operator in both overlap and staggered formulations We discuss the effects leading to chiral symmetry breaking
3 citations