Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Some aspects of thermal field theories   Different formalisms used in the perturbative approach to Thermal Field
Theory (TFT) are briefly reviewed. The rate of production of a virtual photon
in a quark-gluon plasma is then discussed to illustrate some features of TFT
before introducing the Hard Thermal Loop resummation which improves the
behaviour of the theory in the infrared sector. Some of the successes of this
appraoch are described before turning to the problems associated to the
undamped transverse gluon oscillations and the light-cone singularities arising
when on-shell and/or massless particles are involved.

13
The categories of this paper are: quant-ph
5
The categories of this paper are: gr-qc
3
The categories of this paper are: physics
36
The categories of this paper are: cmp-lg
9
The categories of this paper are: nlin
33
The categories of this paper are: plasm-ph
17
The categories of this paper are: q-fin
16
The categories of this paper are: stat
4
The categories of this paper are: cond-mat
1
The categories of this paper are: cs
37
The categories of this paper are: supr-con
23
The categories of this paper are: solv-int
19
The categories of this paper are: eess
24
The categories of this paper are: dg-ga
21
The categories of this paper are: adap-org
2
The categories of this paper are: math