
Geometry, Topology, and Physics Seminar, Winter 2014
Part of the NSF/UCSB ‘Research Training Group’ in Topology and Geometry
Organizers:
Dave Morrison and
Zhenghan Wang.
Meets 4:00  5:30 p.m. on selected Fridays in South Hall 6635.
Other Quarters: [
Fall, 2021;
Winter, 2020;
Fall, 2019;
Spring, 2018;
Winter, 2018;
Fall, 2017;
Spring, 2017;
Wnter, 2017;
Fall, 2016;
Spring, 2016;
Winter, 2016;
Fall, 2015;
Spring, 2015;
Winter, 2014;
Fall, 2013;
Fall, 2012;
Fall, 2011;
Winter, 2011;
Spring, 2010;
Winter, 2010;
Fall, 2009;
Spring, 2009;
Winter, 2009;
Fall, 2008;
Spring, 2008;
Winter, 2008;
Fall, 2007;
Spring, 2007;
Winter, 2007;
Fall, 2006
]
Some related seminars which may be of interest:
Jan. 14 
John Morgan (SCGP)
Abstract:
If the sectional curvature of a manifold is bounded below by a constant K, then geodesics emanating from a point diverge no fasted than geodesics making the same angle in the simply connected surface of constant curvature K. This fundamental observation, due to Toponogov, leads to the theory of Alexandrov spaces, which are metric spaces in which curvature is bounded below by a constant K in the Toponogov sense. These spaces have much structure, leading to a detailed understanding of Alexandrov spaces of dimension at most 2. These in turn of limits of sequences of 3manifolds with collapsing volume, allowing for a complete topological understanding of the latter. This understanding is a crucial ingredient in Perelman's proof of the Geometrization Conjecture for 3manifolds.

Jan. 23 
Dave Morrison (UCSB)
Video, etc.

Jan. 31 
David SimmonsDuffin (Institute for Advanced Study)

Jan. 31 
Leonardo Rastelli (Stony Brook University)


