Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Diffusive density profiles in a cold-atom expansion experiment   In a recent experiment [McGehee et al., Phys. Rev. Lett. 111, 145303 (2013)],
the expansion of non-interacting ultracold fermions was studied in a random
speckle potential, and the observed density profiles were interpreted based on
3D Anderson localization. The purpose of this note is to demonstrate that slow
diffusion of particles with a broad energy distribution and an energy-dependent
diffusion coefficient leads to density profiles that agree with the measured
data, but not with the behavior expected for 3D Anderson localization.

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The categories of this paper are: astro-ph
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The categories of this paper are: quant-ph
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The categories of this paper are: ao-sci
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The categories of this paper are: hep-lat
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The categories of this paper are: nlin
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The categories of this paper are: bayes-an
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The categories of this paper are: solv-int
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The categories of this paper are: plasm-ph
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The categories of this paper are: math-ph
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The categories of this paper are: nucl-ex
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The categories of this paper are: physics
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The categories of this paper are: q-bio
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The categories of this paper are: chao-dyn
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The categories of this paper are: comp-gas
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The categories of this paper are: acc-phys
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The categories of this paper are: cmp-lg