Infrared exponents and the running coupling of Landau gauge QCD and their relation to confinement
Date
2003
Authors
Alkofer, Reinhard
Fischer, Christian S.
von Smekal, Lorenz Johann Maria
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Advisors
Journal Title
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Type:
Journal article
Citation
European Physical Journal A - Hadrons and Nuclei, 2003; 18 (2-3):261-264
Statement of Responsibility
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Abstract
The infrared behaviour of the gluon and ghost propagators in Landau gauge QCD is reviewed. The Kugo-Ojima confinement criterion and the Gribov-Zwanziger horizon condition result from quite general properties of the ghost Dyson-Schwinger equation. The numerical solutions for the gluon and ghost propagators obtained from a truncated set of Dyson-Schwinger equations provide an explicit example for the anticipated infrared behaviour. The results are in good agreement with corresponding lattice data obtained recently. The resulting running-coupling approaches a fix point in the infrared, α(0)=8.92/Nc. Two different fits for the scale dependence of the running coupling are given and discussed.
School/Discipline
School of Chemistry and Physics : Physics and Mathematical Physics