Presented by: 
Pedram Hekmati (University of Adelaide)
Thu 30 May, 2:00 pm - 3:00 pm
Room 442, Building 67

In 1947, L. S. Pontryagin introduced a set of characteristic classes for real vector bundles that are now named after him. Among these, the lowest degree class has a particularly important obstruction theoretic meaning. Namely, its vanishing is tied to the existence of string structures, the chiral de Rham complex, reduction of Courant algebroids and trivialisation of the Chern-Simons 2-gerbe. Our goal is to briefly review this story and explain how these structures behave under topological T-duality.

This is joint work with D. Baraglia.