Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Introduction to Thermal Field Theory   This is intended to be a very basic introduction and short (and of course
incomplete) overview of thermal field theory. In the first part, I introduce
the thermal propagator at a very simple level and give the Feynman rules using
the time-path contour method. In the second part, I give examples of these
rules in scalar theory and discuss the origin of the thermal mass and other
important effects as infrared divergences and phase transitions. In the third
part, I outline the resummation program of Braaten and Pisarski.

21
The categories of this paper are: adap-org
8
The categories of this paper are: hep-ex
1
The categories of this paper are: cs
28
The categories of this paper are: alg-geom
37
The categories of this paper are: supr-con
18
The categories of this paper are: econ
36
The categories of this paper are: cmp-lg
26
The categories of this paper are: bayes-an
15
The categories of this paper are: nucl-ex
17
The categories of this paper are: q-fin
25
The categories of this paper are: patt-sol
29
The categories of this paper are: funct-an
30
The categories of this paper are: q-alg
19
The categories of this paper are: eess
13
The categories of this paper are: quant-ph
3
The categories of this paper are: physics