0 v 1 2 D ec 2 00 5 Calibrations , Torsion Classes and Wrapped M - Branes
نویسنده
چکیده
The present work has two goals. The first is to complete the classification of geometries in terms of torsion classes of M-branes wrapping cycles of a Calabi-Yau. The second goal is to give insight into the physical meaning of the torsion class constraints. We accomplish both tasks by defining new energy minimizing calibrations in M-brane backgrounds. When fluxes are turned on, it is these calibrations that are relevant, rather than those which had previously been defined in the context of purely geometric backgrounds. HUTP-05/A0045 BCCUNY-HEP /05-05 hep-th/0512030 email: Ansar [email protected] email: [email protected]
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