# Next Week's Events

## Seminars

Click on seminar heading to go to seminar page.

• ### Analysis Seminar

Monday April 30, 2018 at 14:40, Wachman 617

Jonathan Weitsman, Northeastern University

We review geometric quantization in the symplectic case, and show how the program of formal geometric quantization can be extended to certain classes of Poisson manifolds equipped with appropriate Hamiltonian group actions. These include $b$-symplectic manifolds, where the quantization turns out to be finite dimensional, as well as more singular examples ($b^k$-symplectic manifolds) where the quantization is finite dimensional for odd $k$ and infinite dimensional, with a very simple asymptotic behavior, when $k$ is even.

This is a joint work with Victor Guillemin and Eva Miranda.

• ### Geometry and Topology Seminar

Tuesday May 1, 2018 at 10:00, Wachman Hall 617
Poincaré Homology Sphere Symposium

Final presentations from Math 9072 on the Poincaré homology sphere and related topics.

Presenters: Thomas Ng, Rebekah Palmer, Khánh Le, and Elham Mantipour.

• ### Geometry and Topology Seminar

Wednesday May 2, 2018 at 14:30, Wachman 617
Coloring curves on surfaces

Jonah Gaster, McGill University
Abstract: In the context of proving that the mapping class group has finite asymptotic dimension, Bestvina-Bromberg-Fujiwara exhibited a finite coloring of the curve graph, i.e. a map from the vertices to a finite set so that vertices of distance one have distinct images. In joint work with Josh Greene and Nicholas Vlamis we give more attention to the minimum number of colors needed. We show: The separating curve graph has chromatic number coarsely equal to g log(g), and the subgraph spanned by vertices in a fixed non-zero homology class is uniquely g-1-colorable. Time permitting, we discuss related questions, including an intriguing relationship with the Johnson homomorphism of the Torelli group.

## Conferences

There are no conferences next week.