Department of Mathematics

Geometry and Topology

  •  Stéphane Guillermou, Institut Fourier
  •  Stable Gauss map of nearby Lagrangians
  •  11/24/2020
  •  11:00 AM - 11:59 AM
  •  Online (virtual meeting) (Virtual Meeting Link)
  •  Honghao Gao (

The stable Gauss map of a Lagrangian $L$ in a cotangent $T^*M$ is a map $g \colon L \to U/O$ obtained by stabilization of the usual Gauss map from $L$ to the Lagrangian Grassmannian of $T^*M$. Arnold's conjecture on nearby Lagrangians implies in particular that $g$ is homotopic to a constant map. We will see the weaker result that the map induced by $g$ on the homotopy groups is trivial. By a theorem of Giroux and Latour $g$ is homotopic to a constant map if and only if $L$ admits a generating function. We introduce ``twisted'' generating functions as a tool to the study of $L$ and make the link with difficult results of pseudo-isotopy theory. This is a joint work with Mohammed Abouzaid, Sylvain Courte and Thomas Kragh.



Department of Mathematics
Michigan State University
619 Red Cedar Road
C212 Wells Hall
East Lansing, MI 48824

Phone: (517) 353-0844
Fax: (517) 432-1562

College of Natural Science