Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Black Holes in Massive Star Clusters   Close encounters and physical collisions between stars in young dense
clusters can result in new channels for stellar evolution, and may lead to the
formation of very massive stars and black holes via runaway merging. We present
some details of this process, using the results of N-body simulations and
simple analytical estimates to place limits on the cluster parameters for which
it expected to occur. For small clusters, the mass of the runaway is
effectively limited by the total number of high-mass stars in the system. For
larger clusters, the runaway mass is determined by the fraction of stars that
can mass-segregate to the cluster core while still on the main sequence. In
typical cases, the result is in the range commonly cited for intermediate-mass
black holes. This mechanism may therefore have important implications for the
formation of massive black holes and black-hole binaries in dense cluster
cores.

17
The categories of this paper are: q-fin
2
The categories of this paper are: math
14
The categories of this paper are: math-ph
1
The categories of this paper are: cs
15
The categories of this paper are: nucl-ex
21
The categories of this paper are: adap-org
9
The categories of this paper are: nlin
12
The categories of this paper are: nucl-th
20
The categories of this paper are: acc-phys
29
The categories of this paper are: funct-an
13
The categories of this paper are: quant-ph
0
The categories of this paper are: hep-ph
3
The categories of this paper are: physics
18
The categories of this paper are: econ
7
The categories of this paper are: hep-th
11
The categories of this paper are: hep-lat