Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Anti-de Sitter Fragmentation   Low-energy, near-horizon scaling limits of black holes which lead to string
theory on AdS_2 x S^2 are described. Unlike the higher-dimensional cases, in
the simplest approach all finite-energy excitations of AdS_2 x S^2 are
suppressed. Surviving zero-energy configurations are described. These can
include tree-like structures in which the AdS_2 x S^2 throat branches as the
horizon is approached, as well as disconnected AdS_2 x S^2 universes. In
principle, the black hole entropy counts the quantum ground states on the
moduli space of such configurations. In a nonsupersymmetric context AdS_D for
general D can be unstable against instanton-mediated fragmentation into
disconnected universes. Several examples are given.

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The categories of this paper are: physics
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The categories of this paper are: stat
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The categories of this paper are: nucl-ex
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The categories of this paper are: chao-dyn
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The categories of this paper are: econ
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The categories of this paper are: plasm-ph
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The categories of this paper are: funct-an
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The categories of this paper are: cmp-lg
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The categories of this paper are: solv-int
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The categories of this paper are: comp-gas
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The categories of this paper are: q-bio
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The categories of this paper are: q-alg
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The categories of this paper are: nlin
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The categories of this paper are: math-ph
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The categories of this paper are: acc-phys
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The categories of this paper are: cond-mat