Köln 2004 – wissenschaftliches Programm

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HK: Physik der Hadronen und Kerne

HK 40: Theory VI

HK 40.1: Gruppenbericht

Donnerstag, 11. März 2004, 13:30–14:00, D

Gluon and ghost propagators at finite and high temperatures in Landau gauge Yang-Mills theory — •Burghard Grüter¹, Axel Maas², Reinhard Alkofer¹, and Jochen Wambach² — ¹Institut für Theoretische Physik, Universität Tübingen, Auf der Morgenstelle 14, 72076 Tübingen — ²Institut für Kernphysik, TU Darmstadt, Schloßgartenstraße 9, 64289 Darmstadt

The infrared behaviour of the gluon and ghost propagators for zero-flavour QCD in Landau gauge is investigated at non-vanishing temperatures. The study is based on an extension of a well understood truncation scheme for Dyson-Schwinger Equations (DSE) at zero temperature [1] to non-vanishing temperature [2].

The results for temperatures below the expected phase transition show only weak temperature dependence. The corresponding CJT effective action will be discussed.

In the high temperature limit the four-dimensional Yang-Mills theory is reduced to a three-dimensional one with an additional adjoint Higgs field. The numerical results obtained from the corresponding DSEs [2] yield a No-dqHiggsNo-dq propagator close to a massive tree-level propagator, indicating the existence of a chromoelectric screening mass at high temperatures. The transverse gluon propagator still is infrared vanishing thus no screening of soft chromomagnetic modes occurs.

[1] C. S. Fischer and R. Alkofer, Phys. Rev. 65 094020(2003)

[2] A. Maas, B. Grüter, R. Alkofer, J. Wambach, hep-ph/0210178

Supported by the European Graduate School Basel-Tübingen (DFG contract GRK683) and BMBF under grand 06DA917