Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Zero Energy Configurations in General Relativity   We investigate the ratio of gravitational binding energy to rest mass in
general relativity. For N pointlike masses, an upper bound on the magnitude of
this ratio can be derived using the second law of black hole dynamics. Only as
N approaches infinity can it approach one. A configuration that saturates the
$N = \infty$ bound is a thin spherical shell as its radius is taken to zero.
This system provides, in principle, a perfectly efficient mechanism for
converting rest mass into energy. We mention possible implications for the
black hole information problem.

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The categories of this paper are: adap-org
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The categories of this paper are: econ
36
The categories of this paper are: cmp-lg
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The categories of this paper are: q-fin
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The categories of this paper are: funct-an
3
The categories of this paper are: physics
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The categories of this paper are: patt-sol
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The categories of this paper are: atom-ph
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The categories of this paper are: supr-con
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The categories of this paper are: cond-mat
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The categories of this paper are: bayes-an
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The categories of this paper are: acc-phys
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The categories of this paper are: dg-ga
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The categories of this paper are: stat
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The categories of this paper are: alg-geom
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The categories of this paper are: q-bio