Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Langevin equation of collective modes of Bose-Einstein condensates in
  traps   A quantum Langevin equation for the amplitudes of the collective modes in
Bose-Einstein condensate is derived. The collective modes are coupled to a
thermal reservoir of quasi-particles, whose elimination leads to the quantum
Langevin equation. The dissipation rates are determined via the correlation
function of the fluctuating force and are evaluated in the local-density
approximation for the spectrum of quasi-particles and the Thomas-Fermi
approximation for the condensate. I take great pleasure in dedicating this
paper to Gregoire Nicolis on the occasion of his sixtieth birthday.

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The categories of this paper are: comp-gas
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The categories of this paper are: dg-ga
10
The categories of this paper are: q-bio
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The categories of this paper are: atom-ph
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The categories of this paper are: mtrl-th
12
The categories of this paper are: nucl-th
37
The categories of this paper are: supr-con
31
The categories of this paper are: ao-sci
1
The categories of this paper are: cs
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The categories of this paper are: solv-int
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The categories of this paper are: q-fin
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The categories of this paper are: alg-geom
3
The categories of this paper are: physics
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The categories of this paper are: bayes-an
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The categories of this paper are: hep-th
9
The categories of this paper are: nlin