Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Particle collisions near static spherically symmetric black holes   It has been shown by Ba\~{n}ados, Silk and West (BSW) that the center of mass
energy (E_cm) of test particles starting from rest at infinity and colliding
near the horizon of a Schwarzschild black hole is always finite. In this
communication, we extent the BSW scenario and study two particles with
different energies colliding near the horizon of a static spherically symmetric
black hole. Surprisingly, we find that even for the static spherically
symmetric (i.e., Schwarzschild like) black holes it is possible to obtain an
arbitrarily high E cm from the two test particles colliding near the horizon of
a black hole, if one fine-tunes the parameters of geodesic motion.

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The categories of this paper are: cs
27
The categories of this paper are: comp-gas
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The categories of this paper are: stat
33
The categories of this paper are: plasm-ph
18
The categories of this paper are: econ
17
The categories of this paper are: q-fin
30
The categories of this paper are: q-alg
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The categories of this paper are: physics
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The categories of this paper are: hep-lat
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The categories of this paper are: math-ph
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The categories of this paper are: quant-ph
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The categories of this paper are: chao-dyn
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The categories of this paper are: funct-an
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The categories of this paper are: hep-th
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The categories of this paper are: hep-ex
34
The categories of this paper are: chem-ph