Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Stability of mass transfer from massive giants: double black-hole binary
  formation and ultra-luminous X-ray sources   The mass transfer in binaries with massive donors and compact companions,
when the donors rapidly evolve after their main sequence, is one of the
dominant formation channels of merging double stellar-mass black hole binaries.
This mass transfer was previously postulated to be unstable and was expected to
lead to a common envelope event. The common envelope event then would end with
either double black hole formation, or with the merger of the two stars. We
re-visit the stability of this mass transfer, and find that for a large range
of the binary orbital separations this mass transfer is stable. This newly
found stability allows us to reconcile the theoretical rate for double black
hole binary mergers predicted by population synthesis studies, and the
empirical rate obtained by LIGO. Futhermore, the stability of the mass transfer
leads to the formation of ultra-luminous X-ray sources. The theoretically
predicted formation rates of ultra-luminous X-ray sources powered by a
stellar-mass BH, as well as the range of produced X-ray luminosity, can explain
the observed bright ultra-luminous X-ray sources.

8
The categories of this paper are: hep-ex
21
The categories of this paper are: adap-org
16
The categories of this paper are: stat
37
The categories of this paper are: supr-con
3
The categories of this paper are: physics
20
The categories of this paper are: acc-phys
0
The categories of this paper are: hep-ph
17
The categories of this paper are: q-fin
25
The categories of this paper are: patt-sol
14
The categories of this paper are: math-ph
24
The categories of this paper are: dg-ga
22
The categories of this paper are: chao-dyn
33
The categories of this paper are: plasm-ph
23
The categories of this paper are: solv-int
36
The categories of this paper are: cmp-lg
31
The categories of this paper are: ao-sci