Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Semiclassical Black Hole States and Entropy   We discuss semiclassical states in quantum gravity corresponding to
Schwarzschild as well as Reissner Nordstr\"om black holes. We show that reduced
quantisation of these models is equivalent to Wheeler-DeWitt quantisation with
a particular factor ordering. We then demonstrate how the entropy of black
holes can be consistently calculated from these states. While this leads to the
Bekenstein-Hawking entropy in the Schwarzschild and non-extreme
Reissner-Nordstr\"om cases, the entropy for the extreme Reissner-Nordstr\"om
case turns out to be zero.

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The categories of this paper are: dg-ga
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The categories of this paper are: mtrl-th
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The categories of this paper are: eess
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The categories of this paper are: funct-an
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The categories of this paper are: q-alg
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The categories of this paper are: q-bio
2
The categories of this paper are: math
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The categories of this paper are: comp-gas
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The categories of this paper are: stat
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The categories of this paper are: q-fin
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The categories of this paper are: adap-org
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The categories of this paper are: alg-geom
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The categories of this paper are: physics
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The categories of this paper are: cmp-lg
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The categories of this paper are: quant-ph
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The categories of this paper are: atom-ph