Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Rapid and Bright Stellar-mass Binary Black Hole Mergers in Active
  Galactic Nuclei   The Laser Interferometer Gravitational-Wave Observatory, LIGO, found direct
evidence for double black hole binaries emitting gravitational waves. Galactic
nuclei are expected to harbor the densest population of stellar-mass black
holes. A significant fraction ($\sim30\%$) of these black holes can reside in
binaries. We examine the fate of the black hole binaries in active galactic
nuclei, which get trapped in the inner region of the accretion disk around the
central supermassive black hole. We show that binary black holes can migrate
into and then rapidly merge within the disk well within a Salpeter time. The
binaries may also accrete a significant amount of gas from the disk, well above
the Eddington rate. This could lead to detectable X-ray or gamma-ray emission,
but would require hyper-Eddington accretion with a few percent radiative
efficiency, comparable to thin disks. We discuss implications for gravitational
wave observations and black hole population studies. We estimate that Advanced
LIGO may detect $\sim20$ such, gas-induced binary mergers per year.

36
The categories of this paper are: cmp-lg
33
The categories of this paper are: plasm-ph
23
The categories of this paper are: solv-int
2
The categories of this paper are: math
31
The categories of this paper are: ao-sci
29
The categories of this paper are: funct-an
8
The categories of this paper are: hep-ex
16
The categories of this paper are: stat
32
The categories of this paper are: atom-ph
3
The categories of this paper are: physics
21
The categories of this paper are: adap-org
10
The categories of this paper are: q-bio
4
The categories of this paper are: cond-mat
15
The categories of this paper are: nucl-ex
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The categories of this paper are: eess
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The categories of this paper are: q-fin