Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Thermalization and pinch singularities in non-equilibrium quantum field
  theory   I argue that, within the Closed-Time-Path formalism, pinch singularities do
not appear in truly out of equilibrium situations.

20
The categories of this paper are: acc-phys
32
The categories of this paper are: atom-ph
23
The categories of this paper are: solv-int
2
The categories of this paper are: math
13
The categories of this paper are: quant-ph
35
The categories of this paper are: mtrl-th
17
The categories of this paper are: q-fin
21
The categories of this paper are: adap-org
33
The categories of this paper are: plasm-ph
26
The categories of this paper are: bayes-an
29
The categories of this paper are: funct-an
19
The categories of this paper are: eess
24
The categories of this paper are: dg-ga
14
The categories of this paper are: math-ph
4
The categories of this paper are: cond-mat
5
The categories of this paper are: gr-qc