Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Black holes and quasiblack holes in Einstein-Maxwell theory   Continuous sequences of asymptotically flat solutions to the Einstein-Maxwell
equations describing regular equilibrium configurations of ordinary matter can
reach a black hole limit. For a distant observer, the spacetime becomes more
and more indistinguishable from the metric of an extreme Kerr-Newman black hole
outside the horizon when approaching the limit. From an internal perspective, a
still regular but non-asymptotically flat spacetime with the extreme
Kerr-Newman near-horizon geometry at spatial infinity forms at the limit.
Interesting special cases are sequences of Papapetrou-Majumdar distributions of
electrically counterpoised dust leading to extreme Reissner-Nordstrom black
holes and sequences of rotating uncharged fluid bodies leading to extreme Kerr
black holes.

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The categories of this paper are: nlin
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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: cmp-lg
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The categories of this paper are: nucl-th
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The categories of this paper are: acc-phys
3
The categories of this paper are: physics
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The categories of this paper are: alg-geom
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The categories of this paper are: econ
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The categories of this paper are: math-ph
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The categories of this paper are: eess
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The categories of this paper are: atom-ph
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The categories of this paper are: adap-org
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The categories of this paper are: cs
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The categories of this paper are: hep-ph
33
The categories of this paper are: plasm-ph