Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Bending Instability of an Accretion Disc Around a Black Hole   We demonstrate that generically an accretion disk around a compact object
could have a new type of instability in that the accretion flow need not be
symmetric with respect to the equatorial plane even when matter is supplied
symmetrically farther out. We find that this behaviour is mainly due to
interaction of outgoing matter bounced off the centrifugal barrier and the
incoming accretion. We believe that X-ray variability could be developed by
this instability.

3
The categories of this paper are: physics
23
The categories of this paper are: solv-int
34
The categories of this paper are: chem-ph
35
The categories of this paper are: mtrl-th
15
The categories of this paper are: nucl-ex
17
The categories of this paper are: q-fin
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The categories of this paper are: gr-qc
12
The categories of this paper are: nucl-th
33
The categories of this paper are: plasm-ph
10
The categories of this paper are: q-bio
19
The categories of this paper are: eess
32
The categories of this paper are: atom-ph
36
The categories of this paper are: cmp-lg
29
The categories of this paper are: funct-an
37
The categories of this paper are: supr-con
21
The categories of this paper are: adap-org