Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Perturbation theory for a non-equilibrium stationary state of a
  one-dimensional stochastic wave equation   We address the problem of constructing a non-equilibrium stationary state for
a one-dimensional stochastic Klein-Gordon wave equation with non-linearity,
using perturbation theory. The linear theory is reviewed, but with the linear
equations of motion including an additional potential term which emerges in the
renormalization of the perturbation expansion for the state corresponding to
the non-linear equations of motion. The potential is the solution to a fixed
point equation. Low order terms in the expansion for the two-point function are
determined.

35
The categories of this paper are: mtrl-th
6
The categories of this paper are: astro-ph
32
The categories of this paper are: atom-ph
25
The categories of this paper are: patt-sol
13
The categories of this paper are: quant-ph
36
The categories of this paper are: cmp-lg
24
The categories of this paper are: dg-ga
0
The categories of this paper are: hep-ph
28
The categories of this paper are: alg-geom
33
The categories of this paper are: plasm-ph
16
The categories of this paper are: stat
30
The categories of this paper are: q-alg
21
The categories of this paper are: adap-org
26
The categories of this paper are: bayes-an
1
The categories of this paper are: cs
19
The categories of this paper are: eess