Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Excitation spectrum of the two-dimensional attractive Hubbard model   We calculate the one-particle spectral functions above the superconducting
transition temperature $T_{C}$, in the framework of a functional integral
approach. The coupling of the electronic self-energy to pair fluctuations,
which are treated by means of a time-dependent Ginzburg-Landau equation, yields
a double-peak structure, around the Fermi wavenumber. The peak separation is
essentially temperature-independent, but the structure sharpens when $T_{C}$ is
approached.

17
The categories of this paper are: q-fin
26
The categories of this paper are: bayes-an
1
The categories of this paper are: cs
6
The categories of this paper are: astro-ph
32
The categories of this paper are: atom-ph
21
The categories of this paper are: adap-org
9
The categories of this paper are: nlin
25
The categories of this paper are: patt-sol
12
The categories of this paper are: nucl-th
5
The categories of this paper are: gr-qc
8
The categories of this paper are: hep-ex
29
The categories of this paper are: funct-an
20
The categories of this paper are: acc-phys
30
The categories of this paper are: q-alg
13
The categories of this paper are: quant-ph
33
The categories of this paper are: plasm-ph