368 research outputs found
Topology without cooling: instantons and monopoles near to deconfinement
In an attempt to describe the change of topological structure of pure SU(2)
gauge theory near deconfinement a renormalization group inspired method is
tested. Instead of cooling, blocking and subsequent inverse blocking is applied
to Monte Carlo configurations to capture topological features at a well-defined
scale. We check that this procedure largely conserves long range physics like
string tension. UV fluctuations and lattice artefacts are removed which
otherwise spoil topological charge density and Abelian monopole currents. We
report the behaviour of topological susceptibility and monopole current
densities across the deconfinement transition and relate the two faces of
topology to each other. First results of a cluster analysis are described.Comment: 6 pages, 8 figures, LaTeX with espcrc2.sty. Talk and poster presented
at Lattice97, Edinburgh, 22-26 July 1997, to appear in Nucl. Phys. B
(Proc.Suppl.
Confinement, deconfinement and the photon propagator in 3D cQED on the lattice
We report on a lattice study of the gauge boson propagator of 3D compact QED
in Landau gauge at zero and finite temperature. Non-perturbative effects are
reflected by the generation of a mass m and by an anomalous dimension alpha.
These effects can be attributed to monopoles and are absent in the propagator
of the regular part of the gauge field.Comment: 3 pages, 4 figures, talk presented by A.S. at 5th International
Conference on Quark Confinement and the Hadron Spectrum, Gargnano, Italy,
10-14 Sep 200
Matter near to the Endpoint of the Electroweak Phase Transition
Wave functions and the screening mass spectrum in the 3D SU(2)-Higgs model
near to the phase transition line below the endpoint and in the crossover
region are calculated. In the crossover region the changing spectrum versus
temperature is examined showing the aftermath of the phase transition at lower
Higgs mass. Large sets of operators with various extensions are used allowing
to identify wave functions in position space.Comment: 3 pages, 8 figures, LaTex+espcrc2.sty; LATTICE98(electroweak
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