Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2008-07-06
Acta Phys.Polon.B39:3365-3393,2008
Physics
High Energy Physics
High Energy Physics - Theory
Lectures at the Cracow School of Theoretical Physics, June 13-22, 2008, Zakopane, Poland; 30 p., 2 figs
Scientific paper
We present a semiclassical description of the SU(N) Yang--Mills theory whose partition function at nonzero temperatures is approximated by that of an ensemble of N kinds of interacting dyons. The ensemble is mathematically described by an exactly solvable 3d quantum field theory, allowing calculation of correlations functions relevant to confinement. We show that all known criteria of confinement are satisfied in this semiclassical approximation: (i) the average Polyakov line is zero below some critical temperature, and nonzero above it, (ii) static quarks in any nonzero N-ality representation have linear rising potential energy, (iii) the average spatial Wilson loop falls off exponentially with the area, (iv) N^2 gluons are canceled out from the spectrum, (v) the critical temperature is in good agreement with lattice data.
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