Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Deriving the Hard Thermal Loops of QCD from Classical Transport Theory   Classical transport theory is employed to analyze the hot quark-gluon plasma
at the leading order in the coupling constant. A condition on the (covariantly
conserved) color current is obtained. {}From this condition, the generating
functional of hard thermal loops with an arbitrary number of soft external
bosonic legs can be derived. Our approach, besides being more direct than
alternative ones, shows that hard thermal loops are essentially classical.

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The categories of this paper are: stat
15
The categories of this paper are: nucl-ex
23
The categories of this paper are: solv-int
9
The categories of this paper are: nlin
34
The categories of this paper are: chem-ph
27
The categories of this paper are: comp-gas
31
The categories of this paper are: ao-sci
17
The categories of this paper are: q-fin
35
The categories of this paper are: mtrl-th
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The categories of this paper are: cmp-lg
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The categories of this paper are: hep-lat
8
The categories of this paper are: hep-ex
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The categories of this paper are: eess
4
The categories of this paper are: cond-mat
28
The categories of this paper are: alg-geom
14
The categories of this paper are: math-ph