Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Entropy and Area of Black Holes in Loop Quantum Gravity   Simple arguments related to the entropy of black holes strongly constrain the
spectrum of the area operator for a Schwarzschild black hole in loop quantum
gravity. In particular, this spectrum is fixed completely by the assumption
that the black hole entropy is maximum. Within the approach discussed, one
arrives in loop quantum gravity at a quantization rule with integer quantum
numbers $n$ for the entropy and area of a black hole.

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The categories of this paper are: hep-ex
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The categories of this paper are: dg-ga
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The categories of this paper are: eess
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The categories of this paper are: hep-lat
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The categories of this paper are: acc-phys
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The categories of this paper are: math
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The categories of this paper are: bayes-an
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The categories of this paper are: adap-org
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The categories of this paper are: nucl-th
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The categories of this paper are: stat
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The categories of this paper are: q-alg
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The categories of this paper are: comp-gas
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The categories of this paper are: patt-sol
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The categories of this paper are: quant-ph
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The categories of this paper are: plasm-ph
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The categories of this paper are: ao-sci