Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Fractional Branes and Boundary States in Orbifold Theories   We study the D-brane spectrum of N=2 string orbifold theories using the
boundary state formalism. The construction is carried out for orbifolds with
isolated singularities, non-isolated singularities and orbifolds with discrete
torsion. Our results agree with the corresponding K-theoretic predictions when
they are available and generalize them when they are not. This suggests that
the classification of boundary states provides a sort of "quantum K-theory"
just as chiral rings in CFT provide "quantum" generalizations of cohomology. We
discuss the identification of these states with D-branes wrapping holomorphic
cycles in the large radius limit of the CFT moduli space. The example C^3/Z_3
is worked out in full detail using local mirror symmetry techniques. We find a
precise correspondence between fractional branes at the orbifold point and
configurations of D-branes described by vector bundles on the exceptional P^2
cycle.

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The categories of this paper are: physics
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The categories of this paper are: acc-phys
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The categories of this paper are: q-fin
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The categories of this paper are: econ
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The categories of this paper are: ao-sci
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The categories of this paper are: hep-ex
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The categories of this paper are: q-alg
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The categories of this paper are: supr-con
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The categories of this paper are: hep-ph
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The categories of this paper are: mtrl-th
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The categories of this paper are: math
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The categories of this paper are: nlin
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The categories of this paper are: chem-ph
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The categories of this paper are: plasm-ph
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The categories of this paper are: adap-org
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The categories of this paper are: nucl-th