Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Ground-State Instabilities in The One-dimensional Penson-Kolb-Hubbard
  Model   Different kinds of instabilities (CDW, SDW, SS) in the 1D Hubbard model with
pair-hopping interaction are investigated using an approximate Bethe-Salpeter
equation. The study is performed at any density of electrons and for arbitrary
values of the model parameters. In the absence of the on-site interaction, no
transition occurs at half filling for any finite negative pair-hopping
parameter, in agreement with recent results; our calculation suggests that the
Penson-Kolb model (t,W) with $\mid W/t\mid<\pi/\sin k^{}_F$ behaves
qualitatively like the Hubbard model (t,U). Phase diagrams of the
Penson-Kolb-Hubbard model (t,U,W) at various densities are presented.

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The categories of this paper are: plasm-ph
2
The categories of this paper are: math
31
The categories of this paper are: ao-sci
10
The categories of this paper are: q-bio
6
The categories of this paper are: astro-ph
24
The categories of this paper are: dg-ga
14
The categories of this paper are: math-ph
8
The categories of this paper are: hep-ex
34
The categories of this paper are: chem-ph
28
The categories of this paper are: alg-geom
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The categories of this paper are: adap-org
11
The categories of this paper are: hep-lat
29
The categories of this paper are: funct-an
3
The categories of this paper are: physics
37
The categories of this paper are: supr-con
18
The categories of this paper are: econ