Berlin 2005 – wissenschaftliches Programm
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HK: Physik der Hadronen und Kerne
HK 12: Theorie
HK 12.2: Vortrag
Freitag, 4. März 2005, 17:00–17:15, TU MA041
The infrared behaviour of QCD propagators at non-vanishing temperatures and densities — •D. Nickel1, R. Alkofer2, B. Grüter2, A. Maas1, W. Schleifenbaum1, and J. Wambach1 — 1Institute for Nuclear Physics, Technical University Darmstadt — 2Institute of Theoretical Physics, Tübingen University
The propagators of QCD, and especially their infrared behavior, contain important information about the phase structure of matter. In our work [1,2,3] we investigate these with a truncated system of Dyson-Schwinger equations in Landau gauge.
We present for the Yang-Mills propagators analytical and numerical results at non-vanishing temperatures. These are in quantitative and qualitative agreement with corresponding lattice results. It turns out that the chromomagnetic sector stays confining even at infinite temperatures.
For the quark propagator at finite chemical potentials we explore the chirally broken and unbroken phase, as well as the superconducting 2SC and CFL phase. The pressure difference between both phases is approximately determined. This method bridges the gap between weak coupling investigations at high densities and densities of the order of nuclear saturation.
[1] A. Maas et al., Eur. Phys. J. C37 (2004) 335.
[2] B. Grüter et al., arXiv:hep-ph/0408282.
[3] W. Schleifenbaum et al., arXiv:hep-ph/0411052.
Supported by the BMBF under grant number 06DA116, and by the Helmholtz association (Virtual Theory Institute VH-VI-041).