810 research outputs found
Quark Confinement from Correlation Functions
We study quark confinement by computing the Polyakov loop potential in
Yang--Mills theory within different non-perturbative functional continuum
approaches [1]. We extend previous studies in the formalism of the functional
renormalisation group and complement those with findings from Dyson--Schwinger
equations and two-particle-irreducible functionals. These methods are
formulated in terms of low order Green functions. This allows to identify a
criterion for confinement solely in terms of the low-momentum behaviour of
correlators.Comment: 8 pages, 3 figures. Talk given at "Xth Quark Confinement and the
Hadron Spectrum", Munich, Germany, Oct. 8-12, 201
Two-colour QCD with heavy quarks at finite densities
We extend the density-of-states approach to gauge systems (LLR method) to QCD
at finite temperature and density with heavy quarks. The approach features an
exponential error suppression and yields the Polyakov loop probability
distribution function over a range of more than hundred orders of magnitude.
SU(2) gauge theory is considered in the confinement and the high-temperature
phase, and at finite densities of heavy quarks. In the latter case, a smooth
rise of the density with the chemical potential is observed, and no critical
phenomenon associated with deconfinement due to finite densities is found.Comment: 4 pages, 5 figure
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