Chern-Weil theory for singular foliations

Speaker: 

Lachlan MacDonald

Affiliation: 

University of Adelaide

Date: 

Tue, 22/06/2021 - 12:00pm

Venue: 

Zoom link: https://unsw.zoom.us/j/81740603495

Abstract: 

Chern-Weil theory describes a procedure for constructing the characteristic classes of a smooth manifold from geometric data (such as a Riemannian metric). In the 1970s and 1980s, Chern-Weil theory was successfully adapted by R. Bott to describe the characteristic classes of the leaf space of any regular foliation, including the so-called secondary classes such as the Godbillon-Vey invariant. The extension of Chern-Weil theory to singular foliations has, however, remained elusive. In this talk, I will describe recent, joint work with Benjamin McMillan which gives a Chern-Weil homomorphism for a family of singular foliations whose singularities are not ``too big".

School Seminar Series: