Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Density Correlations in Cold Atomic Gases: Atomic Speckles in the
  Presence of Disorder   The phenomenon of random intensity patterns, for waves propagating in the
presence of disorder, is well known in optics and in mesoscopic physics. We
study this phenomenon for cold atomic gases expanding, by a diffusion process,
in a weak random potential. We show that the density-density correlation
function of the expanding gas is strongly affected by disorder and we estimate
the typical size of a speckle spot, i.e., a region of enhanced or depleted
density. Both a Fermi gas and a Bose-Einstein condensate (in a mean field
approach) are considered.

14
The categories of this paper are: math-ph
27
The categories of this paper are: comp-gas
37
The categories of this paper are: supr-con
23
The categories of this paper are: solv-int
6
The categories of this paper are: astro-ph
16
The categories of this paper are: stat
19
The categories of this paper are: eess
7
The categories of this paper are: hep-th
15
The categories of this paper are: nucl-ex
22
The categories of this paper are: chao-dyn
34
The categories of this paper are: chem-ph
1
The categories of this paper are: cs
17
The categories of this paper are: q-fin
36
The categories of this paper are: cmp-lg
35
The categories of this paper are: mtrl-th
32
The categories of this paper are: atom-ph