Abstract
We present an explicit formula for the topology and H-flux of the T-dual of a general type II, compactification, significantly generalizing earlier results. Our results apply to T-dualities with respect to any circle action on spacetime X. As before, T-duality exchanges type IIA and type IIB string theories. A new consequence is that the T-dual spacetime is a singular space when the fixed point set \({X^\mathbb{T}}\) is non-empty; the singularities correspond to Kaluza-Klein monopoles. We propose that the Ramond-Ramond charges of type II string theories on the singular dual are classified by twisted equivariant cohomology groups. We also discuss the K-theory approach.
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Communicated by N. A. Nekrasov
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Mathai, V., Wu, S. Topology and Flux of T-Dual Manifolds with Circle Actions. Commun. Math. Phys. 316, 279–286 (2012). https://doi.org/10.1007/s00220-012-1542-8
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DOI: https://doi.org/10.1007/s00220-012-1542-8