Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A Note on Hydrodynamic Viscosity and Selfgravitation in Accretion Disks   We propose a generalized accretion disk viscosity prescription based on
hydrodynamically driven turbulence at the critical effective Reynolds number.
This approach is consistent with recent re-analysis by Richard & Zahn (1999) of
experimental results on turbulent Couette-Taylor flows. This new
$\beta$-viscosity formulation is applied to both selfgravitating and
non-selfgravitating disks and is shown to yield the standard $\alpha$-disk
prescription in the case of shock dissipation limited, non-selfgravitating
disks. A specific case of fully selfgravitating $\beta$-disks is analyzed. We
suggest that such disks may explain the observed spectra of protoplanetary
disks and yield a natural explanation for the radial motions inferred from the
observed metallicity gradients in disk galaxies. The $\beta$-mechanism may also
account for the rapid mass transport required to power ultra luminous infrared
galaxies.

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The categories of this paper are: plasm-ph
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The categories of this paper are: q-alg
16
The categories of this paper are: stat
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The categories of this paper are: patt-sol
1
The categories of this paper are: cs
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The categories of this paper are: q-fin
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The categories of this paper are: eess
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The categories of this paper are: adap-org
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The categories of this paper are: gr-qc
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The categories of this paper are: alg-geom
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The categories of this paper are: hep-ex
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The categories of this paper are: supr-con
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The categories of this paper are: q-bio
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The categories of this paper are: mtrl-th
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The categories of this paper are: dg-ga
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The categories of this paper are: chem-ph