Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Bound states in nonrelativistic four-fermion interaction model   The bound states of two particles are studied in frames of non-relativistic
quantum field model with current $\times$ current type interaction by analyzing
the Bethe-Salpeter amplitudes. The Bethe-Salpeter equations are obtained in
closed form. The existence of Goldstone mode corresponding to the spontaneous
breaking of additional SU(2) symmetry of the model is revealed.

14
The categories of this paper are: math-ph
19
The categories of this paper are: eess
16
The categories of this paper are: stat
0
The categories of this paper are: hep-ph
10
The categories of this paper are: q-bio
6
The categories of this paper are: astro-ph
20
The categories of this paper are: acc-phys
22
The categories of this paper are: chao-dyn
34
The categories of this paper are: chem-ph
4
The categories of this paper are: cond-mat
25
The categories of this paper are: patt-sol
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The categories of this paper are: quant-ph
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The categories of this paper are: alg-geom
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The categories of this paper are: nucl-ex
27
The categories of this paper are: comp-gas
24
The categories of this paper are: dg-ga