Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Viscous Stability of Relativistic Keplerian Accretion Disks   We investigate the viscous stability of thin, Keplerian accretion disks in
regions where general relativistic (GR) effects are essential. For gas pressure
dominated (GPD) disks, we show that the Newtonian conclusion that such disks
are viscously stable is reversed by GR modifications in the behaviors of
viscous stress and surface density over a significantly large annular region
not far from the innermost stable orbit at $r=\rms$. For slowly-rotating
central objects, this region spans a range of radii $14\lo r\lo 19$ in units of
the central object's mass $M$. For radiation pressure dominated (RPD) disks,
the Newtonian conclusion that they are viscously unstable remains valid after
including the above GR modifications, except in a very small annulus around
$r\approx 14M$, which has a negligible influence. Inclusion of the stabilizing
effect of the mass-inflow through the disk's inner edge via a GR analogue of
Roche-lobe overflow adds a small, stable region around \rms~for RPD disks, but
leaves GPD disks unchanged. We mention possible astrophysical relevance of
these results, particularly to the high-frequency X-ray variabilities observed
by the $Rossi$ $X-ray$ $Timing$ $Explorer$.

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The categories of this paper are: hep-ph
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The categories of this paper are: hep-th
19
The categories of this paper are: eess
1
The categories of this paper are: cs
10
The categories of this paper are: q-bio
36
The categories of this paper are: cmp-lg
20
The categories of this paper are: acc-phys
28
The categories of this paper are: alg-geom
11
The categories of this paper are: hep-lat
17
The categories of this paper are: q-fin
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The categories of this paper are: adap-org
30
The categories of this paper are: q-alg
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The categories of this paper are: stat
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The categories of this paper are: cond-mat
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The categories of this paper are: nucl-th
31
The categories of this paper are: ao-sci