Event time:
Thursday, September 25, 2008 - 10:30am to Wednesday, September 24, 2008 - 8:00pm
Location:
LOM 201
Speaker:
Jaejeong Lee
Speaker affiliation:
Yale
Event description:
Convex (or properly convex) projective structures on manifolds share many common features with non-positively curved metrics. The lack of invariant metrics, however, makes it harder to study them. For example, some of the well-known facts about fundamental domains in the case of constant curvature geometries are no longer obvious in projective geometry. In my talk, I will show that every properly convex projective structure admits a convex fundamental polyhedron, which is the Dirichlet domain with respect to a certain distance-like function. The proof makes an essential use of the solution (by Cheng and Yau) of Calabi’s conjecture on complete hyperbolic affine spheres and the duality relation between them.