Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Kelvin Waves of Quantized Vortex Lines in Trapped Bose-Einstein
  Condensates   We have theoretically investigated Kelvin waves of quantized vortex lines in
trapped Bose-Einstein condensates. Counterrotating perturbation induces an
elliptical instability to the initially straight vortex line, driven by a
parametric resonance between a quadrupole mode and a pair of Kelvin modes of
opposite momenta. Subsequently, Kelvin waves rapidly decay to longer
wavelengths emitting sound waves in the process. We present a modified Kelvin
wave dispersion relation for trapped superfluids and propose a simple method to
excite Kelvin waves of specific wave number.

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The categories of this paper are: q-bio
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The categories of this paper are: q-fin
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The categories of this paper are: atom-ph
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The categories of this paper are: bayes-an
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The categories of this paper are: stat
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The categories of this paper are: cs
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The categories of this paper are: alg-geom
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The categories of this paper are: chao-dyn
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The categories of this paper are: hep-th
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The categories of this paper are: patt-sol
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The categories of this paper are: hep-ex
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The categories of this paper are: plasm-ph
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The categories of this paper are: gr-qc
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The categories of this paper are: ao-sci
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The categories of this paper are: eess
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The categories of this paper are: mtrl-th