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Geometry, Physics, and Representation Theory Seminar

RTG Group Seminar

Fall 2019, Northeastern

Meeting weekly on Thursdays 2:50-3:50pm in 509/511 Lake Hall at Northeastern.

If you are not at Northeastern, but would like to recieve announcements, join the mailing list.

Organizers: Alina Marian, Valerio Toledano Laredo, Jonathan Weitsman, Peter Crooks, Robin Walters, Brian Williams, Iva Halacheva, Matej Penciak.

If you have a question or would like to speak at seminar, email


Date Speaker Title
Sep 5 Laure Flapan (MIT) TBA
Sep 12
Sep 19 Chris Gerig (Harvard) Probing 4-manifolds with near-symplectic forms

Most closed 4-manifolds do not admit symplectic forms, but most admit "near-symplectic forms", certain closed 2-forms which are symplectic outside of a collection of circles. This provides a gateway from the symplectic world to the non-symplectic world. Just like the Seiberg-Witten (SW) invariants, there are invariants in terms of J-holomorphic curves that are compatible with the near-symplectic form. Although the SW invariants don't apply to (potentially exotic) 4-spheres, nor do these spheres admit near-symplectic forms, there is still a way to bring in near-symplectic techniques.

Sep 26
Oct 3
Oct 10
Oct 17
Oct 24
Oct 31
Nov 7
Nov 14
Nov 21
Nov 28 No Seminar. Thanksgiving Break.
Dec 5
End of Semester (Seminar Resumes Spring 2020)

Previous Semesters

Spring 2019
Fall 2018
Spring 2018
Fall 2017
Spring 2017
Fall 2016
Spring 2016
Fall 2015
Spring 2015