85 research outputs found
Currents, chemical potential and boundary conditions in lattice QCD
A connection between the operator fermionic currents \hatJ and
corresponding `Grassmannian' currents in the functional integral formalism
is studied. The QCD action with non--zero chemical potential is derived.
A connection between the fermionic Fock space and boundary conditions along the
forth direction is discussed.Comment: Lattice2002 (spectrum
Classical solutions in lattice gauge theories
The solutions of the classical equations of motion on a periodic lattice are
found which correspond to abelian single and double Dirac sheets. These
solutions exist also in non--abelian theories. Possible applications of these
solutions to the calculation of gauge dependent and gauge invariant observables
are discussed.Comment: 13 pages, Latex file including four figure
Lattice QCD gluon propagators near transition temperature
Landau gauge gluon propagators are studied numerically in the SU(3)
gluodynamics as well as in the full QCD with the number of flavors
using efficient gauge fixing technique. We compare these propagators at
temperatures very close to the transition point in two phases : confinement and
deconfinement. The electric mass has been determined from the momentum
space longitudinal gluon propagator. Gribov copy effects are found to be rather
strong in the gluodynamics, while in the full QCD case they are weak ("Gribov
noise"). Also we analyse finite volume dependence of the transverse and
longitudinal propagators.Comment: 9 pages, 7 figure
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