Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Dynamic Hubbard Model: Effect of Finite Boson Frequency   Dynamic Hubbard models describe coupling of a boson degree of freedom to the
on-site electronic double occupancy. In the limit of infinite boson frequency
this coupling gives rise to a correlated hopping term in the effective
Hamiltonian and to superconductivity when the Fermi level is near the top of
the band. Here we study the effect of finite boson frequency through a
generalized Lang-Firsov transformation and a high frequency expansion. It is
found that finite frequency enhances the tendency to superconductivity in this
model.

27
The categories of this paper are: comp-gas
5
The categories of this paper are: gr-qc
31
The categories of this paper are: ao-sci
6
The categories of this paper are: astro-ph
8
The categories of this paper are: hep-ex
34
The categories of this paper are: chem-ph
19
The categories of this paper are: eess
30
The categories of this paper are: q-alg
21
The categories of this paper are: adap-org
10
The categories of this paper are: q-bio
15
The categories of this paper are: nucl-ex
7
The categories of this paper are: hep-th
25
The categories of this paper are: patt-sol
1
The categories of this paper are: cs
22
The categories of this paper are: chao-dyn
36
The categories of this paper are: cmp-lg