# Geometry and Topology Seminar 2019-2020

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## Spring 2011

The seminar will be held in room B901 of Van Vleck Hall on Fridays from 1:20pm - 2:10pm

date | speaker | title | host(s) |
---|---|---|---|

January 21 | Mohammed Abouzaid (Clay Institute & MIT) | Yong-Geun | |

March 4 | David Massey (Northeastern) | Maxim | |

March 11 | Danny Calegari (Cal Tech)) | Yong-Geun | |

May 6 | Alex Suciu (Northeastern) | Maxim |

## Abstracts

### Mohammed Abouzaid (Clay Institute & MIT)

*A plethora of exotic Stein manifolds*

In real dimensions greater than 4, I will explain how a smooth manifold underlying an affine variety admits uncountably many distinct (Wein)stein structures, of which countably many have finite type, and which are distinguished by their symplectic cohomology groups. Starting with a Lefschetz fibration on such a variety, I shall per- form an explicit sequence of appropriate surgeries, keeping track of the changes to the Fukaya category and hence, by understanding open-closed maps, obtain descriptions of symplectic cohomology af- ter surgery. (joint work with P. Seidel)

### David Massey (Northeastern)

*TBA*

### Danny Calegari (Cal Tech)

*TBA*

### Alex Suciu (Northeastern)

*TBA*