Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: On nonequilibrium states in QFT model with boundary interaction   We prove that certain nonequilibrium expectation values in the boundary
sine-Gordon model coincide with associated equilibrium-state expectation values
in the systems which differ from the boundary sine-Gordon in that certain extra
boundary degrees of freedom (q-oscillators) are added. Applications of this
result to actual calculation of nonequilibrium characteristics of the boundary
sine-Gordon model are also discussed.

32
The categories of this paper are: atom-ph
37
The categories of this paper are: supr-con
21
The categories of this paper are: adap-org
28
The categories of this paper are: alg-geom
5
The categories of this paper are: gr-qc
2
The categories of this paper are: math
25
The categories of this paper are: patt-sol
22
The categories of this paper are: chao-dyn
14
The categories of this paper are: math-ph
23
The categories of this paper are: solv-int
34
The categories of this paper are: chem-ph
35
The categories of this paper are: mtrl-th
18
The categories of this paper are: econ
24
The categories of this paper are: dg-ga
6
The categories of this paper are: astro-ph
9
The categories of this paper are: nlin