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Cluster decomposition, T-duality, and gerby CFT's

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arxiv hep-th/0606034 v5 pith:ZFJ5WGBJ submitted 2006-06-05 hep-th

classification hep-th
keywords clusterdecompositionlackdisconnecteddualityt-dualitytargetstheories
verification ladder T0 review T1 audit T2 compute T3 formal
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In this paper we study CFT's associated to gerbes. These theories suffer from a lack of cluster decomposition, but this problem can be resolved: the CFT's are the same as CFT's for disconnected targets. Such theories also lack cluster decomposition, but in that form, the lack is manifestly not very problematic. In particular, we shall see that this matching of CFT's, this duality between noneffective gaugings and sigma models on disconnected targets, is a worldsheet duality related to T-duality. We perform a wide variety of tests of this claim, ranging from checking partition functions at arbitrary genus to D-branes to mirror symmetry. We also discuss a number of applications of these results, including predictions for quantum cohomology and Gromov-Witten theory and additional physical understanding of the geometric Langlands program.

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Cited by 10 Pith papers

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