Results 1 - 10 of 665

Infrared and ultraviolet properties of the Landau gauge quark propagator

by Patrick O. Bowman A, Urs M. Heller B, Derek B. Leinweber A, Anthony G. Williams A, Jianbo Zhang A , 2004
"... We present a current summary of a program to study the quark propagator using lattice QCD. We use the Overlap and “Asqtad ” quark actions on a number of lattice ensembles to assess systematic errors. We comment on the place of this work amongst studies of QCD Green’s functions in other formulations. ..."
Abstract - Add to MetaCart
We present a current summary of a program to study the quark propagator using lattice QCD. We use the Overlap and “Asqtad ” quark actions on a number of lattice ensembles to assess systematic errors. We comment on the place of this work amongst studies of QCD Green’s functions in other formulations

Analytic structure of the Landau gauge gluon propagator

by R. Alkofer, W. Detmold, C. S. Fischer, P. Maris , 2004
"... Abstract. The results of different non-perturbative studies agree on a power law as the infrared behavior of the Landau gauge gluon propagator. This propagator violates positivity and thus indicates the absence of the transverse gluons from the physical spectrum, i.e. gluon confinement. A simple ana ..."
Abstract - Add to MetaCart
analytic structure for the gluon propagator is proposed capturing all of its features. We comment also on related investigations for the Landau gauge quark propagator.

Overlap Quark Propagator in Landau Gauge ADP-01-44/T476

by Frédéric D. R. Bonnet, Patrick O. Bowman, Derek B. Leinweber, Anthony G. Williams, Jianbo Zhang , 2002
"... The properties of the quark propagator in Landau gauge in quenched QCD are examined for the overlap quark action. The overlap quark action satisfies the Ginsparg-Wilson relation and as such provides an exact lattice realization of chiral symmetry. This in turn implies that the quark action is free o ..."
Abstract - Add to MetaCart
The properties of the quark propagator in Landau gauge in quenched QCD are examined for the overlap quark action. The overlap quark action satisfies the Ginsparg-Wilson relation and as such provides an exact lattice realization of chiral symmetry. This in turn implies that the quark action is free

Analytic structure of the gluon and quark propagators in Landau gauge QCD ∗

by unknown authors , 2004
"... In Landau gauge QCD the infrared behavior of the propagator of transverse gluons can be analytically determined to be a power law from Dyson–Schwinger equations. This propagator clearly shows positivity violation, indicating the absence of the transverse gluons from the physical spectrum, i.e. gluon ..."
Abstract - Add to MetaCart
.e. gluon confinement. A simple analytic structure for the gluon propagator is proposed capturing all important features. We provide arguments that the Landau gauge quark propagator possesses a singularity on the real timelike axis. For this propagator we find a positive definite Schwinger function

On the Landau-gauge adjoint quark propagator

by Daniel August, Axel Maas , 2014
"... ar ..."
Abstract - Add to MetaCart
Abstract not found

Quark condensates and the deconfinement transition

by Christian S. Fischer, Jens A. Mueller, Christian S. Fischer , 2009
"... In this talk we present results on the chiral and the deconfinement transition of quenched QCD from Dyson-Schwinger equations. We determine the ordinary quark condensate signaling the chiral transition and the dual quark condensate signaling the deconfinement transition from the Landau gauge quark p ..."
Abstract - Add to MetaCart
In this talk we present results on the chiral and the deconfinement transition of quenched QCD from Dyson-Schwinger equations. We determine the ordinary quark condensate signaling the chiral transition and the dual quark condensate signaling the deconfinement transition from the Landau gauge quark

1 Lattice Quark Propagator in Landau and Laplacian Gauges

by Patrick O. Bowman A, Urs M. Heller A, Anthony G. Williams B , 2001
"... We present results for the lattice quark propagator in both Landau and Laplacian gauges using standard and improved staggered quark actions. The standard Kogut-Susskind action has errors ofO(a 2) while the improved “Asqtad ” action hasO(a 4),O(a 2 g 2) errors. This improvement is seen in the quark p ..."
Abstract - Add to MetaCart
We present results for the lattice quark propagator in both Landau and Laplacian gauges using standard and improved staggered quark actions. The standard Kogut-Susskind action has errors ofO(a 2) while the improved “Asqtad ” action hasO(a 4),O(a 2 g 2) errors. This improvement is seen in the quark

Scaling Behavior of the Landau Gauge Overlap Quark Propagator

by J. B. Zhang A, F. D. R. Bonnet Ab, P. O. Bowman A, D. B. Leinweber A, A. G. Williams A , 2003
"... The properties of the momentum space quark propagator in Landau gauge are examined for the overlap quark action in quenched lattice QCD. Numerical calculations are done on three lattices with different lattice spacings and similar physical volumes to explore the approach of the quark propagator towa ..."
Abstract - Add to MetaCart
The properties of the momentum space quark propagator in Landau gauge are examined for the overlap quark action in quenched lattice QCD. Numerical calculations are done on three lattices with different lattice spacings and similar physical volumes to explore the approach of the quark propagator

KUGO–OJIMA CONFINEMENT CRITERION, ZWANZIGER–GRIBOV HORIZON CONDITION, AND INFRARED CRITICAL EXPONENTS IN Landau Gauge QCD

by R. Alkofer, C. S. Fischer, L. von Smekal , 2003
"... The Kugo–Ojima confinement criterion and its relation to the infrared behaviour of the gluon and ghost propagators in Landau gauge QCD are reviewed. The realization of this confinement criterion (which in Landau gauge relates to Zwanziger’s horizon condition) results from quite general properties of ..."
Abstract - Add to MetaCart
of the gluon spectral function is apparent in the gluon propagator, there are no clear indications of positivity violations in the Landau gauge quark propagator.

The Quark-Gluon Vertex in Landau gauge QCD

by Markus Hopfer, Andreas Windisch, Reinhard Alkofer , 2012
"... The coupled system of the quark-gluon vertex and quark propagator Dyson-Schwinger equations (DSEs) is investigated within Landau gauge QCD. The aim is to get a deeper insight into the mechanisms of quark confinement and dynamical chiral symmetry breaking and into a possible relation between these tw ..."
Abstract - Add to MetaCart
The coupled system of the quark-gluon vertex and quark propagator Dyson-Schwinger equations (DSEs) is investigated within Landau gauge QCD. The aim is to get a deeper insight into the mechanisms of quark confinement and dynamical chiral symmetry breaking and into a possible relation between
Results 1 - 10 of 665