Physics – High Energy Physics – High Energy Physics - Lattice
Scientific paper
2008-01-28
Phys.Rev.D77:094007,2008
Physics
High Energy Physics
High Energy Physics - Lattice
Several comments added; final version to appear in PRD
Scientific paper
10.1103/PhysRevD.77.094007
We construct a new order parameter for finite temperature QCD by considering the quark condensate for U(1)-valued temporal boundary conditions for the fermions. Fourier transformation with respect to the boundary condition defines the dual condensate. This quantity corresponds to an equivalence class of Polyakov loops, thereby being an order parameter for the center symmetry. We explore the duality relation between the quark condensate and these dressed Polyakov loops numerically, using quenched lattice QCD configurations below and above the QCD phase transition. It is demonstrated that the Dirac spectrum responds differently to changing the boundary condition, in a manner that reproduces the expected Polyakov loop pattern. We find the dressed Polyakov loops to be dominated by the lowest Dirac modes, in contrast to thin Polyakov loops investigated earlier.
Bilgici Erek
Bruckmann Falk
Gattringer Christof
Hagen Christian
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