Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Canaries in a Coal Mine: Using Globular Clusters to Place Limits on
  Massive Black Holes in the Galactic Halo   We explore the possibility that massive black holes comprise a significant
fraction of the dark matter of our galaxy by studying the dissolution of
galactic globular clusters bombarded by them. In our simulations, we evolve the
clusters along a sequence of King models determined by changes of state
resulting from collisions with the black holes. The results divide naturally
into regimes of `small' and `large' black hole mass. `Small' black holes do not
destroy clusters in single collisions; their effect is primarily cumulative,
leading to a relation between $\mbh$ and $\fhalo$, the fraction of the halo in
black holes of mass $\mbh$, which is $\fhalo\mbh < $ constant (up to
logarithmic corrections). For $\fhalo=1$, we find $\mbh \simless 10^{3} \msun$
by requiring survival of the same clusters studied by Moore (1993), who
neglected cluster evolution, mass loss, and stochasticity of energy inputs in
his estimates, but reached a similar conclusion. `Large' black holes may not
penetrate a cluster without disrupting it; their effect is mainly catastrophic
(close collisions), but also partly cumulative (distant collisions). In the
large $\mbh$ limit, $\fhalo$ (but not $\mbh$) can be constrained by computing
the probability that a cluster survives a combination of close, destructive
encounters and distant, nondestructive encounters. We find that it is unlikely
that $\fhalo \simgreat 0.3$ by requiring 50 per cent survival probability for
Moore's clusters over $10^{10}$ years.

12
The categories of this paper are: nucl-th
10
The categories of this paper are: q-bio
33
The categories of this paper are: plasm-ph
22
The categories of this paper are: chao-dyn
5
The categories of this paper are: gr-qc
26
The categories of this paper are: bayes-an
1
The categories of this paper are: cs
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The categories of this paper are: funct-an
31
The categories of this paper are: ao-sci
4
The categories of this paper are: cond-mat
7
The categories of this paper are: hep-th
11
The categories of this paper are: hep-lat
32
The categories of this paper are: atom-ph
3
The categories of this paper are: physics
23
The categories of this paper are: solv-int
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The categories of this paper are: nlin