Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Symmetry breaking and the random-phase approximation in small quantum
  dots   The random-phase approximation has been used to compute the properties of
parabolic two-dimensional quantum dots beyond the mean-field approximation.
Special emphasis is put on the ground state correlation energy, the symmetry
restoration and the role of the spurious modes within the random-phase
approximation. A systematics with the Coulombic interaction strength is
presented for the 2-electron dot, while for the 6- and 12-electron dots
selected cases are discussed. The validity of the random-phase approximation is
assessed by comparison with available exact results.

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The categories of this paper are: math-ph
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The categories of this paper are: funct-an
34
The categories of this paper are: chem-ph
6
The categories of this paper are: astro-ph
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The categories of this paper are: eess
20
The categories of this paper are: acc-phys
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The categories of this paper are: quant-ph
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The categories of this paper are: patt-sol
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The categories of this paper are: chao-dyn
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The categories of this paper are: adap-org
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The categories of this paper are: nucl-ex
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The categories of this paper are: solv-int
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The categories of this paper are: econ
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The categories of this paper are: stat
11
The categories of this paper are: hep-lat
32
The categories of this paper are: atom-ph