Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: BCS-BEC Crossover Effects and Pseudogap in Neutron Matter   Due to the large neutron-neutron scattering length, dilute neutron matter
resembles the unitary Fermi gas, which lies half-way in the crossover from the
BCS phase of weakly coupled Cooper pairs to the Bose-Einstein condensate of
dimers. We discuss crossover effects in analogy with the T-matrix theory used
in the physics of ultracold atoms, which we generalize to the case of a
non-separable finite-range interaction. A problem of the standard
Nozieres-Schmitt-Rink approach and different ways to solve it are discussed. It
is shown that in the strong-coupling regime, the spectral function exhibits a
pseudo-gap at temperatures above the critical temperature T_c. The effect of
the correlated density on the density dependence of T_c is found to be rather
weak, but a possibly important effect due to the reduced quasiparticle weight
is identified.

6
The categories of this paper are: astro-ph
13
The categories of this paper are: quant-ph
22
The categories of this paper are: chao-dyn
7
The categories of this paper are: hep-th
24
The categories of this paper are: dg-ga
2
The categories of this paper are: math
18
The categories of this paper are: econ
32
The categories of this paper are: atom-ph
15
The categories of this paper are: nucl-ex
16
The categories of this paper are: stat
8
The categories of this paper are: hep-ex
11
The categories of this paper are: hep-lat
14
The categories of this paper are: math-ph
23
The categories of this paper are: solv-int
1
The categories of this paper are: cs
29
The categories of this paper are: funct-an