Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Stochastic modeling of kHz QPO light curves   The Kluzniak & Abramowicz model explains high frequency, double peak, "3:2"
QPOs observed in neutron star and black hole sources in terms of a non-linear
parametric resonance between radial and vertical epicyclic oscillations of an
almost Keplerian accretion disk. The 3:2 ratio of epicyclic frequencies occurs
only in strong gravity. Rebusco (2004) and Horak (2004) studied the model
analytically: they proved that a small forcing may indeed excite the parametric
3:2 resonance, but they have not explained the physical nature of the forcing.
Here we integrate their equations numerically, dropping the ad hoc forcing, and
adding instead a stochastic term to mimic the action of the very complex
processes that occur in disks as, for example,
  MRI turbulence. We demonstrate that the presence of the stochastic term
triggers the resonance in epicyclic oscillations of nearly Keplerian disks, and
influences their pattern.

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The categories of this paper are: patt-sol
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The categories of this paper are: funct-an
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The categories of this paper are: supr-con
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The categories of this paper are: ao-sci
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The categories of this paper are: alg-geom
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The categories of this paper are: plasm-ph
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The categories of this paper are: chao-dyn
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The categories of this paper are: cs
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The categories of this paper are: physics
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The categories of this paper are: nucl-th
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The categories of this paper are: hep-th
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The categories of this paper are: econ
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The categories of this paper are: q-fin
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The categories of this paper are: hep-ph
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The categories of this paper are: q-bio
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The categories of this paper are: gr-qc