Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Phase diffusion in stationary state of nonequilibrium Bose gas   Properties of low energy spectrum of elementary excitations in nonequilibrium
Bose gas in stationary state with the dynamical equilibrium of outgoing and
incoming of particles are studied. It is shown that due to the noise effect,
typical for nonequilibrium systems, this spectrum has a diffusion character, in
contradiction with the thermodynamically equilibrium systems, where this
spectrum has a sound form.

13
The categories of this paper are: quant-ph
34
The categories of this paper are: chem-ph
33
The categories of this paper are: plasm-ph
10
The categories of this paper are: q-bio
29
The categories of this paper are: funct-an
35
The categories of this paper are: mtrl-th
28
The categories of this paper are: alg-geom
23
The categories of this paper are: solv-int
36
The categories of this paper are: cmp-lg
32
The categories of this paper are: atom-ph
31
The categories of this paper are: ao-sci
30
The categories of this paper are: q-alg
5
The categories of this paper are: gr-qc
6
The categories of this paper are: astro-ph
11
The categories of this paper are: hep-lat
8
The categories of this paper are: hep-ex