Showing papers by "Manfried Faber published in 1995"
TL;DR: In this paper, the authors compare U (1) lattice gauge theory to an effective model of the Maxwell and London equations, and show that one can get good agreement between both models if one modifies the usual definition of magnetic monopole currents in U(1) LF theory.
25 citations
TL;DR: In this article, a relativistic field theory model of the deuteron is proposed, which is based on the Nambu-Jona-Lasinio prescription.
19 citations
TL;DR: In this paper, the authors investigated the general phase structure of finite temperature gauge theories with discrete Z(N) symmetry and showed that low and high temperature phases turn out to be different in both ensembles even for infinite systems.
18 citations
01 Apr 1995
TL;DR: In this paper, it was shown that the canonical formulation of QCD in the usual finite temperature formulation does not explicitly break Z (3) symmetry and behaves in this sense like pure gluonic QCD.
Abstract: QCD in the usual finite temperature formulation is using the grand canonical ensemble with chemical potential zero. We demonstrate that this description may give wrong predictions. QCD in the canonical formulation does not explicitly break Z (3) symmetry. It behaves in this sense like pure gluonic QCD. There are no metastable states in the canonical ensemble description as predicted in the grand canonical ensemble formalism.
6 citations
TL;DR: In this article, the effective action of a dual Dirac string was determined within a 4-dimensional formulation of Dirac's extension of Electro-dynamics supplemented by the dual London equation of superconductivity.
6 citations
01 Apr 1995
TL;DR: In this paper, a numerical investigation of topological structures around static quarks in pure-gauge QCD with dynamical quarks is presented, and the results of the first runs are updated by results of a second run with dynamic quarks.
Abstract: We update our numerical investigation of topological structures around static quarks in pure gauge QCD by results of the first runs including dynamical quarks. Simulations were performed on an 83 × 4 lattice, with SU(3) Wilson action, with 3 flavours of quarks of equal mass, both in the confinement and deconfinement phase. In the confinement phase we observe indications for the existence of a flux tube between a static quark and antiquark, flux-tube breaking for large separations, and local correlation between the topological charge density and chiral condensate. In the deconfinement phase almost all configurations turn out to be topologically trivial.
3 citations
TL;DR: In this article, the authors compare U(1) lattice gauge theory to an effective model of the Maxwell and London equations, and show that one can get good agreement between both models if one modifies the usual definition of magnetic monopole currents in U( 1) LF theory.
Abstract: We compare U(1) lattice gauge theory to an effective model of Maxwell and London equations. In the effective model there is only one free parameter, the London penetration depth lambda. It turns out that one can get good agreement between both models if one modifies the usual definition of magnetic monopole currents in U(1) lattice gauge theory. This comparison also shows that already at small distances fluctuations of the occuring string are important. Further, we investigate the beta-dependence of the penetration depth and determine the suppression of the monopole condensate in flux tubes.
1 citations
TL;DR: In this paper, the mass spectra of scalar, pseudoscalar, vector and axial-vector diquarks were analyzed and it was shown that low-lying baryons cannot be described by the diquark-quark picture.
Abstract: We explore the diquark-quark picture of the octet and the decuplet of low-lying baryons in QCD with a linear confinement potential. The mass spectra of scalar, pseudoscalar, vector and axial-vector diquarks, transforming like\((\underline {\widetilde3} _f ,\underline {\widetilde3} _c )\) and\((\underline 6 _f ,\underline {\widetilde3} _c )\), are analysed. For scalar, pseudoscalar and vector diquarks we find bound states with massesMS≃MP=1.95 GeV, andMV=2.40 GeV, whereas for axial-vector diquarks no bound states exist. We conclude that low-lying baryons cannot be described by the diquark-quark picture. Our results confirm the three-body structure of low-lying baryons, and lead to an unambiguously fixed spinor structure of three-quark currents of low-lying baryons as proposed by Ioffe, Pascual and Tarrach.
1 citations
TL;DR: In this paper, the authors investigated the general phase structure of finite temperature gauge theories with discrete Z(N) symmetry and showed that low and high temperature phases turn out to be different in both ensembles even for infinite systems.
Abstract: Discrete symmetries in grand canonical ensembles and in ensembles canonical with respect to triality are investigated. We speculate about the general phase structure of finite temperature gauge theories with discrete $Z(N)$ symmetry. Low and high temperature phases turn out to be different in both ensembles even for infinite systems. It is argued that gauge theories with matter fields in the fundamental representation should be treated in ensembles canonical with respect to triality if one wants to avoid unphysical predictions. Further, we discuss as a physical consequence of such a treatment the impossibility of the existence of metastable phases in the quark-gluon plasma.
1 citations