Time: Thursday Nov. 8, 10:00-12:00.

Speaker: Professor Siye Wu (University of Hong Kong).

Title: Topology and flux of T-Dual manifolds with circle and torus actions

Abstract: We present an explicit formula for the topology and H-flux of the T-dual of a general type II compactification with respect to any circle or torus action on spacetime. A new consequence is that the T-dual spacetime is a singular space when the action is not free. We propose that the Ramond-Ramond charges of type II string theories on the singular dual are classified by twisted equivariant cohomology groups. This is a joint work with Mathai.

Venue: Room 09 at Quan-Zhai (全斋), Beijing International Center for Mathematical Research, Peking University.