Serie : Astérisque. Vol 337
Paru le 30/01/2011 | Broché VI-134 pages
Professionnels
Using the differentiable structure, twisted 2-periodic de Rham cohomology is well known, and showing up as the Larget of Chern characters for twisted K-theory. The main motivation of this work is a topological interpretation of two-periodic twisted de Rham cohomology which is generalizable to arbitrary topological spaces and at the same time to arbitrary coefficients.
To this end we develop a sheaf theory in the context of locally compact topological stacks with emphasis on :
The main result is the construction of a functorial periodization associated to a U (1)-gerbe.
As an application we verify the T-duality isomorphism in periodic twisted cohomology and in periodic twisted orbispace cohomology.
