Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Black holes and branes in string theory   This is a set of introductory lecture notes on black holes in string theory.
After reviewing some aspects of string theory such as dualities, brane
solutions, supersymmetric and non-extremal intersection rules, we analyze in
detail extremal and non-extremal 5d black holes. We first present the D-brane
counting for extremal black holes. Then we show that 4d and 5d non-extremal
black holes can be mapped to the BTZ black hole (times a compact manifold) by
means of dualities. The validity of these dualities is analyzed in detail. We
present an analysis of the same system in the spirit of the adS/CFT
correspondence. In the ``near-horizon'' limit (which is actually a near
inner-horizon limit for non-extremal black holes) the black hole reduces again
to the BTZ black hole. A state counting is presented in terms of the BTZ black
hole.

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The categories of this paper are: astro-ph
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The categories of this paper are: patt-sol
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The categories of this paper are: q-fin
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The categories of this paper are: dg-ga
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The categories of this paper are: q-alg
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The categories of this paper are: atom-ph
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The categories of this paper are: cmp-lg
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The categories of this paper are: eess
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The categories of this paper are: supr-con
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The categories of this paper are: adap-org
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The categories of this paper are: chao-dyn
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The categories of this paper are: nucl-ex
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The categories of this paper are: ao-sci
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The categories of this paper are: plasm-ph
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The categories of this paper are: mtrl-th
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The categories of this paper are: alg-geom