Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Gravitational Microlensing by the Globular Cluster Stars   The microlensing of background stars by compact objects in globular clusters
is analyzed. The main strength of the proposed search is the direct
relationship between the lens mass and the time scale of the microlensing
event. The main problem is the low overall rate of expected events which
implies that a ground based search should last for about a decade to generate a
non trivial number of events, like a few dozen. A space borne experiment could
increase the rate by a large factor by increasing the number of stars which
could be monitored thanks to the much better seeing. The clusters M22 with the
galactic bulge background, and 47 Tuc with the SMC background, are the two
examples of possible targets.

3
The categories of this paper are: physics
16
The categories of this paper are: stat
0
The categories of this paper are: hep-ph
15
The categories of this paper are: nucl-ex
1
The categories of this paper are: cs
11
The categories of this paper are: hep-lat
26
The categories of this paper are: bayes-an
12
The categories of this paper are: nucl-th
32
The categories of this paper are: atom-ph
24
The categories of this paper are: dg-ga
27
The categories of this paper are: comp-gas
2
The categories of this paper are: math
5
The categories of this paper are: gr-qc
23
The categories of this paper are: solv-int
13
The categories of this paper are: quant-ph
36
The categories of this paper are: cmp-lg