Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Colliding black holes: how far can the close approximation go?   We study the head-on collision of two equal-mass momentarily stationary black
holes, using black hole perturbation theory up to second order. Compared to
first-order results, this significantly improves agreement with numerically
computed waveforms and energy. Much more important, second-order results
correctly indicate the range of validity of perturbation theory. This use of
second-order, to provide ``error bars,'' makes perturbation theory a viable
tool for providing benchmarks for numerical relativity in more generic
collisions and, in some range of collision parameters, for supplying waveform
templates for gravitational wave detection.

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The categories of this paper are: hep-th
3
The categories of this paper are: physics
30
The categories of this paper are: q-alg
12
The categories of this paper are: nucl-th
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The categories of this paper are: econ
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The categories of this paper are: hep-lat
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The categories of this paper are: adap-org
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The categories of this paper are: nucl-ex
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The categories of this paper are: comp-gas
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The categories of this paper are: chao-dyn
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The categories of this paper are: dg-ga
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The categories of this paper are: math-ph
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The categories of this paper are: hep-ex
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The categories of this paper are: math
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The categories of this paper are: supr-con
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The categories of this paper are: cmp-lg