The SGGT seminar meets on Fridays in Math 407 from 11:00 am to 12:00 pm, unless noted otherwise (in red).
Previous semesters: Fall 2023, Spring 2023, Fall 2022, Spring 2020, Fall 2019, Spring 2019, Fall 2018, Spring 2018, Fall 2017, Spring 2017, Fall 2016, Spring 2016, Fall 2015, Spring 2015, Fall 2014, Spring 2014, Fall 2013, Spring 2013, Fall 2012, Spring 2012, Fall 2011, Spring 2011, Fall 2010, Spring 2010, Fall 2009, Spring 2009, Fall 2008, Spring 2008, Fall 2007.
Schedule
Date  Speaker  Title 
Jan 19, 11:00 am 
José Simental (UNAM)

Cluster structure on braid varieties 
Jan 26, 11:00 am 
Alex Xu (Columbia)

The SeibergWitten Equations and Einstein Metrics on Finite Volume 4Manifolds with Asymptotically Hyperbolic Ends 
Feb 02, 11:00 am 
Chris Woodward (Rutgers)

Tropical disk counting in almost toric manifolds 
Feb 09, 11:00 am 
Yi Wang (Purdue)

A simple chain model of loop spaces and application to the study of Lagrangian submanifolds 
Feb 16, 11:00 am 
Spencer Cattalani (Stony Brook)

Complex Cycles and Symplectic Topology 
Feb 23, 11:00 am 
Deeparaj Bhat (MIT)

Surgery exact triangles in instanton theory 
Mar 01, 11:00 am 
Joseph Breen (U Iowa)

The Giroux correspondence in arbitrary dimensions 
Mar 08, 11:00 am 
Daniel Pomerleano (UMass Boston)

TBA 
Mar 22, 11:00 am 
Oliver Edtmair (UC Berkeley)

TBA 
Mar 29, 11:00 am 
Thomas Guidoni (Sorbonne)

TBA 
Apr 05, 11:00 am 
Roman Krutowski (UCLA)

TBA 
Apr 12, 11:00 am 
Eric Zaslow (Northwestern)

TBA 
Apr 19, 11:00 am 
Mohan Swaminathan (Stanford)

TBA 
Apr 26, 11:00 am 
Jiakai Li (Harvard)

TBA 
Abstracts
Jan 19: José Simental (UNAM) "Cluster structure on braid varieties"
Abstract: The braid varieties of the title are smooth affine algebraic varieties that naturally generalize important Lietheoretic varieties such as double Bruhat cells, positroid varieties and, more generally, open Richardson varieties on the flag variety. Thanks to works of Kálmán and CasalsNg, they also appear as the augmentation variety of a class of (1)closures of positive braids. In this talk, based on joint work with Roger Casals, Eugene Gorsky, Mikhail Gorsky, Ian Le and Linhui Shen, I will explain how to give the coordinate algebra of a braid variety the structure of a FominZelevinsky cluster algebra. The main combinatorial input is that of a weave, a colored graph that encodes positions of flags, and defines an open torus inside the braid variety. No prior knowledge of cluster algebras will be assumed.