Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The Infrared Behaviour of the Running Coupling in Landau Gauge QCD   Approximate solutions for the gluon and ghost propagators as well as the
running coupling in Landau gauge Yang-Mills theories are presented. These
propagators obtained from the corresponding Dyson-Schwinger equations are in
remarkable agreement with those of recent lattice calculations. The resulting
running coupling possesses an infrared fixed point, $\alpha_S(0) = 8.92/N_c$
for all gauge groups SU($N_c$). Above one GeV the running coupling rapidly
approaches its perturbative form.

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The categories of this paper are: dg-ga
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The categories of this paper are: hep-th
1
The categories of this paper are: cs
4
The categories of this paper are: cond-mat
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The categories of this paper are: funct-an
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The categories of this paper are: atom-ph
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The categories of this paper are: chem-ph
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The categories of this paper are: bayes-an
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The categories of this paper are: math-ph
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The categories of this paper are: solv-int
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The categories of this paper are: eess
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The categories of this paper are: astro-ph
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The categories of this paper are: nucl-ex
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The categories of this paper are: math
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The categories of this paper are: q-alg
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The categories of this paper are: comp-gas