18088194
What are the confining field configurations of strong-coupling lattice gauge theory?
Starting from the strong-coupling SU(2) Wilson action in D = 3 dimensions, we derive an effective, semi-local action on a lattice of spacing L times the spacing of the original lattice. It is shown that beyond the adjoint color-screening distance, i.e. for L ≥ 5, thin center vortices are stable saddlepoints of the corresponding effective action. Since the entropy of these stable objects exceeds their action, center vortices percolate throughout the lattice, and confine color charge in half-integer representations of the SU(2) gauge group. This result contradicts the folklore that confinement in strong-coupling lattice gauge theory, for D > 2 dimensions, is simply due to plaquette disorder, as is the case in D = 2 dimensions. It also demonstrates explicitly how the emergence and stability of center vortices are related to the existence of color screening by gluon fields.
2981504
Massless Thirring fermion fields in the boson field representation
We show that the boson field representation of the massless fermion fields, suggested by Morchio, Pierotti and Strocchi in J. Math. Phys. 33, 777 (1992) for the operator solution of the massless Thirring model, agrees completely with the existence of the chirally broken phase in the massless Thirring model revealed in EPJC 20, 723 (2001) and hep-th/0112183, when the free massless boson fields are described by the quantum field theory, free of infrared divergences in 1+1-dimensional space-time, formulated in hep-th/0112184 and hep-th/0204237.
15560655
Direct Laplacian Center Gauge
We introduce a variation of direct maximal center gauge fixing: the ``direct laplacian'' center gauge. The new procedure overcomes certain shortcomings of maximal center gauge, associated with Gribov copies, that were pointed out by Bornyakov et al. in hep-lat/0009035.
119276344
Electro-magnetic waves within a model for charged solitons
We analyse the model of topological fermions (MTF), where charged fermions are treated as soliton solutions of the field equations. In the region far from the sources we find plane waves solutions with the properties of electro-magnetic waves.
123417355
Confinement in quantum field theories
Abstract We compare electromagnetic field distributions around a static charge-anticharge system for compact U(1) and SU(3) lattice gauge theories. We display flux tube formation for both internal symmetry groups in the confinement phase and its breaking beyond the deconfinement phase transition. The dependence of the string width on the dipole elongation is studied and the roughening mechanism is explored. Our results suggest that the energy density is restricted to a thin flux tube both in the SU(3) and U(1) case in the confinement regime.
67814691
Some Cautionary Remarks on Abelian Projection and Abelian Dominance
Abstract Some critical remarks are presented, concerning the abelian projection theory of quark confinement.
124960626
Beam characterization with video imaging systems at the ANL 50 MeV H/sup -/ beamline
Video imaging systems consisting of scintillators, charge-coupled device (CCD) cameras, and in-beam CCD detectors are being used to characterize beams at the Argonne National Laboratory (ANL) 50 MeV H/sup -/ beamline. The characterization technique consists of placing pinholes, slits, or wires in the beam and viewing the resulting images or shadows on a downstream scintillator or CCD. The images are digitally recorded using a frame grabber and stored in computer memory where they are analyzed to determine Twiss parameters and local beam divergence. Since many of the measurements involve low-intensity beams and require good position resolution, studies have been performed on scintillators to obtain sensitivity and resolution data. Various scintillators, including Rarex, CsI, and CaF/sub 2/, have been evaluated. An in-beam CCD imager has also been tested.<<ETX>>
22020112
Operating Experience with the Resonance Extraction Slow Spill Control System at the Zero Gradient Synchrotron
Simultaneous resonance extraction to two proton lines became operational in spring of 1975. The spill quality was initially poor due to 100% structure in the two to six kHz range. This paper describes the empirical techniques developed to provide a smooth spill. These techniques consist of applying radial or azimuthal disturbances to the proton beam. It has been found that the most effective disturbing frequency depends uniquely on the beam momentum. Quite an array of new equipment had to be built for magnetic control of the unbunched beam. Brief descriptions of this equipment are provided.