Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Pair correlations of an expanding superfluid Fermi gas   The pair correlation function of an expanding gas is investigated with an
emphasis on the BEC-BCS crossover of a superfluid Fermi gas at zero
temperature. At unitarity quantum Monte Carlo simulations reveal the occurrence
of a sizable bunching effect due to interactions in the spin up-down channel
which, at short distances, is larger than that exhibited by thermal bosons in
the Hanbury-Brown and Twiss effect. We propose a local equilibrium ansatz for
the pair correlation function which we predict will remain isotropic during the
expansion even if the trapping potential is anisotropic, contrary to what
happens for non-interacting gases. This behavior is understood to be a
consequence of the violation of scaling of the pair correlation function due to
interactions.

11
The categories of this paper are: hep-lat
20
The categories of this paper are: acc-phys
15
The categories of this paper are: nucl-ex
18
The categories of this paper are: econ
1
The categories of this paper are: cs
14
The categories of this paper are: math-ph
21
The categories of this paper are: adap-org
34
The categories of this paper are: chem-ph
29
The categories of this paper are: funct-an
19
The categories of this paper are: eess
6
The categories of this paper are: astro-ph
2
The categories of this paper are: math
37
The categories of this paper are: supr-con
28
The categories of this paper are: alg-geom
27
The categories of this paper are: comp-gas
13
The categories of this paper are: quant-ph