Alessandro Valentino (Edinburgh):   Differential Cohomology and Quantum Gauge Fields
 
The aim of this seminar is to illustrate the role played recently by (generalized) differential cohomology theories in abelian gauge field theories, which include the theory of B-field and Ramond-Ramond fields in string theory. In particular, we will discuss a recent construction of the Hilbert space of such fields, as proposed by Freed, Moore, and Segal, and, time permitting, propose a generalization of these arguments to the specific case of Ramond-Ramond fields on orbifolds.