Physics – High Energy Physics – High Energy Physics - Lattice
Scientific paper
2004-07-30
Phys.Rev. D70 (2004) 074504
Physics
High Energy Physics
High Energy Physics - Lattice
14 pages, 3 figures, 1 table; note and reference added
Scientific paper
10.1103/PhysRevD.70.074504
It appears well accepted in the literature that the correlator of Polyakov loops in a finite temperature system decays with the "average" free energy of the static quark-antiquark system, and can be decomposed into singlet and adjoint (or octet for QCD) contributions. By fixing a gauge respecting the transfer matrix, attempts have been made to extract those contributions separately. In this paper we point out that the "average" and "adjoint" channels of Polyakov loop correlators are misconceptions. We show analytically that all channels receive contributions from singlet states only, and give a corrected definition of the singlet free energy. We verify this finding by simulations of the 3d SU(2) pure gauge theory in the zero temperature limit, which allows to cleanly extract the ground state exponents and the non-trivial matrix elements. The latter account for the difference between the channels observed in previous simulations.
Jahn Oliver
Philipsen Owe
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