14,764 research outputs found
Schwinger-Dyson equations and the quark-antiquark static potential
In lattice QCD, a confining potential for a static quark-antiquark pair can
be computed with the Wilson loop technique. This potential, dominated by a
linear potential at moderate distances, is consistent with the confinement with
a flux tube, an extended and scalar system also directly observable in lattice
QCD. Quantized flux tubes have also been observed in another class of
confinement, the magnetic confinement in type II superconductors. On the other
hand the solution of Schwinger Dyson Equations, say with the Landau gauge
fixing and the truncation of the series of Feynman diagrams, already at the
rainbow level for the self energy and at the ladder level for the Bethe
Salpeter equation, provides a signal of a possible inverse quartic potential in
momentum space derived from one gluon and one ghost exchange, consistent with
confinement. Here we address the successes, difficulties and open problems of
the matching of these two different perspectives of confinement, the
Schwinger-Dyson perspective versus the flux tube perspective.Comment: 12 pages, 18 figures; talk presented at QCD-TNT, Trento, 7-11 sep
200
Landau Gauge Fixing on GPUs
In this paper we present and explore the performance of Landau gauge fixing
in GPUs using CUDA. We consider the steepest descent algorithm with Fourier
acceleration, and compare the GPU performance with a parallel CPU
implementation. Using lattice volumes, we find that the computational
power of a single Tesla C2070 GPU is equivalent to approximately 256 CPU cores.Comment: 10 pages, 3 figures and 3 table
Landau Gauge Fixing on GPUs and String Tension
We explore the performance of CUDA in performing Landau gauge fixing in
Lattice QCD, using the steepest descent method with Fourier acceleration. The
code performance was tested in a Tesla C2070, Fermi architecture. We also
present a study of the string tension at finite temperature in the confined
phase. The string tension is extracted from the color averaged free energy and
from the color singlet using Landau gauge fixing.Comment: 7 pages, 4 figures, 1 table. Contribution to the International
Meeting "Excited QCD", Peniche, Portugal, 06 - 12 May 201
Landau gauge fixing on the lattice using GPU's
In this work, we consider the GPU implementation of the steepest descent
method with Fourier acceleration for Laudau gauge fixing, using CUDA. The
performance of the code in a Tesla C2070 GPU is compared with a parallel CPU
implementation.Comment: 3 pages, 1 figure, Proceedings of the Xth Quark Confinement and the
Hadron Spectrum, 8-12 October 2012, TUM Campus Garching, Munich, German
Gluons at finite temperature
The gluon propagator is investigated at finite temperature via lattice simulations. In particular, we discuss its interpretation as a massive-type bosonic propagator. Moreover, we compute the corresponding spectral density and study the violation of spectral positivity. Finally, we explore the dependence of the gluon propagator on the phase of the Polyakov loop
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