Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Oscillations of radiation pressure supported tori near black holes   We study the dynamics of radiation pressure supported tori around
Schwarzschild black holes, focusing on their oscillatory response to an
external perturbation. Using KORAL, a general relativistic radiation
hydrodynamics code capable of modeling all radiative regimes from the optically
thick to the optically thin, we monitor a sample of models at different initial
temperatures and opacities, evolving them in two spatial dimensions for $\sim
165$ orbital periods. The dynamics of models with high opacity is very similar
to that of purely hydrodynamics models, and it is characterized by regular
oscillations which are visible also in the light curves. As the opacity is
decreased, the tori quickly and violently migrate towards the gas-pressure
dominated regime, collapsing towards the equatorial plane. When the spectra of
the $L_2$ norm of the mass density are considered, high frequency
inertial-acoustic modes of oscillations are detected (with the fundamental mode
at a frequency $68 M_{\rm BH}^{-1}\,\rm Hz$), in close analogy to the
phenomenology of purely hydrodynamic models. An additional mode of oscillation,
at a frequency $129 M_{\rm BH}^{-1}\,\rm Hz$, is also found, which can be
unambiguously attributed to the radiation. The spectra extracted from the light
curves are typically more noisy, indicating that in a real observation such
modes would not be easily detected.

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The categories of this paper are: q-alg
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The categories of this paper are: gr-qc
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The categories of this paper are: q-bio
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The categories of this paper are: comp-gas
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The categories of this paper are: quant-ph
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The categories of this paper are: chem-ph
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The categories of this paper are: hep-lat
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The categories of this paper are: hep-th
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The categories of this paper are: adap-org
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The categories of this paper are: dg-ga
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The categories of this paper are: cs
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The categories of this paper are: cmp-lg
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The categories of this paper are: hep-ph
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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: nucl-ex