Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A note on the calculation of the long-wavelength limit of the bosonic
  excitation spectrum   An approach is proposed to analyze an interacting bosonic system using
two-time temperature Green's functions on the collective variables. Two systems
are studied: liquid helium-4 and the Yukawa Bose-liquid being a model of the
nuclear matter. The suggested decoupling in the equations of motion for Green's
functions yields a good description of the elementary excitation spectrum in
the long-wavelength limit.

37
The categories of this paper are: supr-con
18
The categories of this paper are: econ
28
The categories of this paper are: alg-geom
10
The categories of this paper are: q-bio
8
The categories of this paper are: hep-ex
36
The categories of this paper are: cmp-lg
32
The categories of this paper are: atom-ph
5
The categories of this paper are: gr-qc
12
The categories of this paper are: nucl-th
29
The categories of this paper are: funct-an
34
The categories of this paper are: chem-ph
35
The categories of this paper are: mtrl-th
0
The categories of this paper are: hep-ph
27
The categories of this paper are: comp-gas
11
The categories of this paper are: hep-lat
31
The categories of this paper are: ao-sci