Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Diffusion of cold atomic gases in the presence of an optical speckle
  potential   We consider diffusion of a cold Fermi gas in the presence of a random optical
speckle potential. The evolution of the initial atomic cloud in space and time
is discussed. Analytical and numerical results are presented in various
regimes. Diffusion of a Bose-Einstein condensate is also briefly discussed and
similarity with the Fermi gas case is pointed out.

6
The categories of this paper are: astro-ph
36
The categories of this paper are: cmp-lg
2
The categories of this paper are: math
22
The categories of this paper are: chao-dyn
27
The categories of this paper are: comp-gas
30
The categories of this paper are: q-alg
29
The categories of this paper are: funct-an
24
The categories of this paper are: dg-ga
23
The categories of this paper are: solv-int
8
The categories of this paper are: hep-ex
20
The categories of this paper are: acc-phys
26
The categories of this paper are: bayes-an
17
The categories of this paper are: q-fin
21
The categories of this paper are: adap-org
16
The categories of this paper are: stat
25
The categories of this paper are: patt-sol