Clay specialist lectures (2), University of Sydney
Name: | Clay specialist lectures (2), University of Sydney |
Calendar: | 1-day meetings & lectures |
When: | Fri, September 18, 2009, 11:00 pm - Sat, September 19, 2009, 4:30 am |
Description: |
Abstract: (Calegari) Stable commutator lengthThe scl (stable commutator length) answers the question: what is the simplest surface in a given space with prescribed boundary? where simplest is interpreted in topological terms. This topological definition is complemented by several equivalent definitions:
On the topological side, scl is concerned with questions such as computing the genus of a knot, or finding the simplest 4-manifold that bounds a given 3-manifold. On the linear programming side, scl is measured in terms of certain functions called quasimorphisms, which arise from hyperbolic geometry (negative curvature) and symplectic geometry (causal structures). We will discuss how scl in free and surface groups is connected to such diverse phenomena as the existence of closed surface subgroups in graphs of groups, rigidity and discreteness of symplectic representations, bounding immersed curves on a surface by immersed subsurfaces, and the theory of multi-dimensional continued fractions and Klein polyhedra. Abstract: (Abouzaid) A mirror construction for hypersurfaces in toric varietiesThe Strominger–Yau–Zaslow conjecture gives an intrinsic explanation for Homological Mirror Symmetry in the case of Calabi–Yau manifolds. I will explain that by extending the SYZ conjecture beyond the Calabi–Yau case, one may associate a Landau–Ginzburg mirror to generic hypersurfaces in toric varieties. The key idea is to use tropical geometry to reduce the problem to understanding the mirror of hyperplanes. |
Location: | Room 275 Carslaw Building, University of Sydney Map |
URL: | /tiki-read_article.php?articleId=61 |
Created: | 06 Jun 2009 02:47 am UTC |
Modified: | 18 Aug 2009 09:57 pm UTC |
By: | rmoore |
Status: | Confirmed |