Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Gerbes over Orbifolds and Twisted K-theory   In this paper we construct an explicit geometric model for the group of
gerbes over an orbifold $X$. We show how from its curvature we can obtain its
characteristic class in $H^3(X)$ via Chern-Weil theory. For an arbitrary gerbe
$\LL$, a twisting $\Korb{\LL}(X)$ of the orbifold $K$-theory of $X$ is
constructed, and shown to generalize previous twisting by Rosenberg, Witten,
Atiyah-Segal and Bowknegt et. al. in the smooth case and by Adem-Ruan for
discrete torsion on an orbifold.

27
The categories of this paper are: comp-gas
28
The categories of this paper are: alg-geom
35
The categories of this paper are: mtrl-th
6
The categories of this paper are: astro-ph
26
The categories of this paper are: bayes-an
33
The categories of this paper are: plasm-ph
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The categories of this paper are: ao-sci
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The categories of this paper are: adap-org
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The categories of this paper are: stat
13
The categories of this paper are: quant-ph
10
The categories of this paper are: q-bio
8
The categories of this paper are: hep-ex
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The categories of this paper are: atom-ph
25
The categories of this paper are: patt-sol
29
The categories of this paper are: funct-an
0
The categories of this paper are: hep-ph