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T-duality and Differential K-Theory (0912.2516v2)
Published 14 Dec 2009 in math.KT, hep-th, and math.DG
Abstract: We give a precise formulation of T-duality for Ramond-Ramond fields. This gives a canonical isomorphism between the "geometrically invariant" subgroups of the twisted differential K-theory of certain principal torus bundles. Our result combines topological T-duality with the Buscher rules found in physics.