6,068 research outputs found
What we do understand of Colour Confinement
A review is presented of what we understand of colour confinement in QCD.
Lattice formulation provides evidence that QCD vacuum is a dual superconductor:
the chromoelectric field of a pair is constrained by dual Meissner
effect into a dual Abrikosov flux tube and the static potential energy is
proportional to the distance.Comment: 10 pages, 5 figures, plenary talk at "Quark Matter 99", Torino,
Italy, May 10-15, 199
Topology in QCD with 4 flavours of dynamical fermions
We study the topological properties of full QCD with four flavours of
dynamical staggered fermions. In particular the topological susceptibility is
measured and the problem of the determination of its first derivative is
discussed.Comment: LATTICE99(Topology and Confinement). 3 pages, contains espcrc2.sty
fil
Topological properties of QCD with two dynamical fermions
We investigate the topological susceptibility of the QCD vacuum with two
flavours of dynamical staggered fermions on the lattice both at zero and finite
temperature. At zero temperature we study the dependence of the signal on the
fermion mass and at finite temperature we analyze the behaviour across the
phase transition.Comment: LATTICE99(finite temperature and density). 3 pages, contains
espcrc2.sty fil
Topological susceptibility at zero and finite in SU(3) Yang-Mills theory
We determine the topological susceptibility at T=0 in pure SU(3) gauge
theory and its behaviour at finite across the deconfining transition. We
use an improved topological charge density operator. drops sharply by
one order of magnitude at the deconfining temperature .Comment: Recently appeared erratum added as an "Appendix" to the original
pape
Topological susceptibility through the deconfining phase transition
We present a measurement of the topological susceptibility in SU(3)
Yang-Mills theory through the deconfinement phase transition. An improved
operator is used for the topological charge density. A drop by an order of
magnitude is observed from the confined to the deconfined phase.Comment: Talk presented at LATTICE96(topology). 3 pages, 2 postscript figures,
uses espcrc2.sty include
Vortices versus monopoles in color confinement
We construct the creation operator of a vortex for SU(2) pure gauge theory
using the methods developed for monopoles. We interpret its vacuum expectation
value as a disorder parameter for the deconfinement phase transition and find
that it behaves in the vacuum in a similar way to monopoles. Results are
extrapolated to the thermodynamical limit using finite-size scaling.Comment: Talk presented at Lattice2000 (Topology and Vacuum), 4 page
A disorder analysis of the Ising model
Lattice studies of monopole condensation in QCD are based on the construction
of a disorder parameter, a creation operator of monopoles which is written in
terms of the gauge fields. This procedure is expected to work for any system
which presents duality. We check it on the Ising model in 2d, which is exactly
solvable. The output is an amusing exercise in statistical mechanics.Comment: 14 pages, 3 figure
Chiral transition and deconfinement in N_f = 2 QCD
The transition is studied by means of a disorder parameter detecting
condensation of magnetic monopoles in the vacuum. The deconfining transition is
found to coincide with the chiral transition and the susceptibility \rho,
related to the disorder parameter, is consistent with a first order phase
transition.Comment: 3 pages, 2 figures. Poster presented at Lattice2004(topology),
Fermilab, June 21-26, 200
Monopoles, vortices and confinement in SU(3) gauge theory
We compute, in SU(3) pure gauge theory, the vacuum expectation value (vev) of
the operator which creates a vortex wrapping the lattice through periodic
boundary conditions (dual Polyakov line). The technique used is the same
already tested in the SU(2) case. The dual Polyakov line proves to be a good
disorder parameter for confinement, and has a similar behaviour to the monopole
condensate. The new features which characterise the construction of the
disorder operator in SU(3) are emphasised.Comment: 8 pages, 4 eps figures, typed with elsart.cl
Dual Superconductivity and Chiral Symmetry in Full QCD
A disorder parameter detecting dual superconductivity of the vacuum is
measured across the chiral phase transition in full QCD with two flavours of
dynamical staggered fermions. The observed behaviour is similar to the quenched
case.Comment: Lattice2001(confinement) proceedings, 3 pages, 2 eps figure
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