Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Weakly interacting two-dimensional system of dipoles: limitations of
  mean-field theory   We consider a homogeneous 2D Bose gas with repulsive dipole-dipole
interactions. The ground-state equation of state, calculated using the
Diffusion Monte Carlo method, shows quantitative differences with predictions
of commonly used Gross-Pitaevskii mean-field theory. The static structure
factor, pair distribution function and condensate fraction are calculated in a
wide range of the gas parameter. Differences with mean-field theory are
reflected in the frequency of the lowest ``breathing'' mode for harmonically
trapped systems.

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The categories of this paper are: q-fin
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The categories of this paper are: q-alg
12
The categories of this paper are: nucl-th
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The categories of this paper are: eess
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The categories of this paper are: acc-phys
32
The categories of this paper are: atom-ph
25
The categories of this paper are: patt-sol
5
The categories of this paper are: gr-qc
13
The categories of this paper are: quant-ph
10
The categories of this paper are: q-bio
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The categories of this paper are: supr-con
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The categories of this paper are: math-ph
3
The categories of this paper are: physics
29
The categories of this paper are: funct-an
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The categories of this paper are: bayes-an
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The categories of this paper are: chao-dyn