Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Close Binaries with Two Compact Objects   The coalescence of close binary systems with two compact objects (neutron
stars and black holes) are considered to be promising sources of gravitational
waves for the currently built laser interferometers. Here, I review the current
Galactic coalescence estimates derived both theoretically and empirically. I
discuss the uncertainties involved as well as ways of obtaining an upper limit
to the coalescence rate of two neutron stars.

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The categories of this paper are: hep-ex
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The categories of this paper are: nlin
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The categories of this paper are: hep-th
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The categories of this paper are: gr-qc
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The categories of this paper are: comp-gas
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The categories of this paper are: patt-sol
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The categories of this paper are: acc-phys
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The categories of this paper are: q-alg
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The categories of this paper are: econ
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The categories of this paper are: solv-int
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The categories of this paper are: eess
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The categories of this paper are: stat
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The categories of this paper are: supr-con
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The categories of this paper are: cs
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The categories of this paper are: hep-ph
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The categories of this paper are: dg-ga