11 research outputs found
U(1) flux tube profiles from Hamiltonian lattice gauge theory using a random walk ground-state projector
We use a self-guided random walk to solve the ground-state problem of
Hamiltonian U(1) pure gauge theory in 2+1 dimensions in the string sector. By
making use of the electric-field representation, we argue that the spatial
distribution of the electric field can be more easily measured than in ordinary
Monte Carlo simulations.Comment: 3 pages, contribution to Lattice 94, uuencoded compressed Postscrip
Monopole Loop Distribution and Confinement in SU(2) Lattice Gauge Theory
The abelian-projected monopole loop distribution is extracted from maximal
abelian gauge simulations. The number of loops of a given length falls as a
power of the length nearly independent of lattice size. This power increases
with , reaching five around , beyond which loops any
finite fraction of the lattice size vanish in the infinite lattice limit,
suggesting the continuum theory lacks confinement.Comment: 6 pages Latex, 4 eps figures. Minor editing. Final version, to appear
in Physics Letters
On the screening of the potential between adjoint sources in
We calculate the potential between adjoint sources in pure gauge
theory in three dimensions. We investigate whether the potential saturates at
large separations due to the creation of a pair of gluelumps, colour-singlet
states formed when glue binds to an adjoint source.Comment: 3 pages, uuencoded Z-compressed postscript file, contribution to
Lattice '9
Topological charge density around static colour sources in lattice QCD with dynamical quarks
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 lattice, with
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.Comment: 3 pages, PostScript, uuencoded and compressed tar file (Contribution
to LATTICE 94 in Bielefeld.
``GLUELUMP'' SPECTRUM AND ADJOINT SOURCE POTENTIAL IN LATTICE QCD
We calculate the potential between ``quarks'' which are in the adjoint
representation of SU(2) color in the three-dimensional lattice theory. We work
in the scaling region of the theory and at large quark separations . We also
calculate the masses of color-singlet bound states formed by coupling
an adjoint quark to adjoint glue (``gluelumps''). Good scaling behavior is
found for the masses of both magnetic (angular momentum ) and electric
() gluelumps, and the magnetic gluelump is found to be the lowest-lying
state. It is naively expected that the potential for adjoint quarks should
saturate above a separation where it becomes energetically
favorable to produce a pair of gluelumps. We obtain a good estimate of the
naive screening distance . However we find little evidence of
saturation in the potential out to separations of about twice .Comment: 8 pages plus 8 figures in 2 postscript files (uuencoded
Can a Logarithmically Running Coupling Mimic a String Tension?
It is shown that a Coulomb potential using a running coupling slightly
modified from the perturbative form can produce an interquark potential that
appears nearly linear over a large distance range. Recent high-statistics SU(2)
lattice gauge theory data fit well to this potential without the need for a
linear string-tension term. This calls into question the accuracy of string
tension measurements which are based on the assumption of a constant
coefficient for the Coulomb term. It also opens up the possibility of obtaining
an effectively confining potential from gluon exchange alone.Comment: 13 pages, LaTeX, two figures not included, available from author.
revision - Line lengths fixed so it will tex properl