Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A Boltzmann Equation for the QCD Plasma   We present a derivation of a Boltzmann equation for the QCD plasma, starting
from the quantum field equations. The derivation is based on a gauge covariant
gradient expansion which takes consistently into account all possible
dependences on the gauge coupling assumed to be small. We point out a
limitation of the gradient expansion arising when the range of the interactions
becomes comparable with that of the space-time inhomogeneities of the system.
The method is first applied to the case of scalar electrodynamics, and then to
the description of long wavelength colour fluctuations in the QCD plasma. In
the latter case, we recover B\"odeker's effective theory and its recent
reformulation by Arnold, Son and Yaffe. We discuss interesting cancellations
among various collision terms, which occur in the calculation of most transport
coefficients, but not in that of the quasiparticle lifetime, or in that of the
relaxation time of colour excitations.

25
The categories of this paper are: patt-sol
17
The categories of this paper are: q-fin
13
The categories of this paper are: quant-ph
14
The categories of this paper are: math-ph
6
The categories of this paper are: astro-ph
21
The categories of this paper are: adap-org
4
The categories of this paper are: cond-mat
37
The categories of this paper are: supr-con
16
The categories of this paper are: stat
28
The categories of this paper are: alg-geom
2
The categories of this paper are: math
23
The categories of this paper are: solv-int
11
The categories of this paper are: hep-lat
24
The categories of this paper are: dg-ga
33
The categories of this paper are: plasm-ph
1
The categories of this paper are: cs