Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Variability from Nonaxisymmetric Fluctuations Interacting with Standing
  Shocks in Tilted Black Hole Accretion Disks   We study the spatial and temporal behavior of fluid in fully
three-dimensional, general relativistic, magnetohydrodynamical simulations of
both tilted and untilted black hole accretion flows. We uncover
characteristically greater variability in tilted simulations at frequencies
similar to those predicted by the formalism of trapped modes, but ultimately
conclude that its spatial structure is inconsistent with a modal
interpretation. We find instead that previously identified, transient,
over-dense clumps orbiting on roughly Keplerian trajectories appear generically
in our global simulations, independent of tilt. Associated with these
fluctuations are acoustic spiral waves interior to the orbits of the clumps. We
show that the two nonaxisymmetric standing shock structures that exist in the
inner regions of these tilted flows effectively amplify the variability caused
by these spiral waves to markedly higher levels than in untilted flows, which
lack standing shocks. Our identification of clumps, spirals, and spiral-shock
interactions in these fully general relativistic, magnetohydrodynamical
simulations suggests that these features may be important dynamical elements in
models which incorporate tilt as a way to explain the observed variability in
black hole accretion flows.

31
The categories of this paper are: ao-sci
37
The categories of this paper are: supr-con
5
The categories of this paper are: gr-qc
26
The categories of this paper are: bayes-an
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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: econ
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The categories of this paper are: dg-ga
13
The categories of this paper are: quant-ph
16
The categories of this paper are: stat
7
The categories of this paper are: hep-th
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The categories of this paper are: chao-dyn
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The categories of this paper are: physics
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The categories of this paper are: mtrl-th
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The categories of this paper are: math-ph
17
The categories of this paper are: q-fin