Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Low lying twisting and acoustic modes of a rotating Bose-Einstein
  condensate   We present a calculation of the low lying spectrum of a rotating
Bose-Einstein condensate. We show that in a cylindrical geometry, there exist
two linear branches, one associated to usual acoustic excitation, the other
corresponding to a twisting mode of the vortex lattice. Using a hydrodynamical
approach we derive the elasticity coefficient of the vortex lattice and
calculate the spectrum of condensate in a three dimensionnal harmonic trap with
cylindrical symmetry.

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The categories of this paper are: astro-ph
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The categories of this paper are: alg-geom
2
The categories of this paper are: math
23
The categories of this paper are: solv-int
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The categories of this paper are: nucl-th
1
The categories of this paper are: cs
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The categories of this paper are: stat
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The categories of this paper are: q-fin
35
The categories of this paper are: mtrl-th
3
The categories of this paper are: physics
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The categories of this paper are: nucl-ex
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The categories of this paper are: nlin
11
The categories of this paper are: hep-lat
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The categories of this paper are: acc-phys
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The categories of this paper are: funct-an
14
The categories of this paper are: math-ph