Previous Special Year Seminar

Apr
27
2021

SL2 Seminar

Invariance and monodromy of microlocal sheaves
4:00pm|Remote Access

I'll review results and examples of the invariance and monodromy of microlocal sheaves under mutations of their support. Then I'll suggest some problems in geometric representation theory where we would like to apply such techniques.

Apr
22
2021

Quantum Groups Seminar

Kazhdan-Lusztig category
Jin-Cheng Guu
4:00pm|Remote Access

The talk introduces the Kazhdan-Lusztig categories of representations of affine Lie algebras

Apr
20
2021

SL2 Seminar

Perverse sheaves on Grassmannians via microlocal geometry
4:00pm|Remote Access

I will present a finite-dimensional quiver algebra whose representations are equivalent to the category of Schubert-constructible perverse sheaves on the Grassmannian $Gr(k,n)$. The functor inducing the equivalence is constructed by analyzing the...

Apr
14
2021

Geometric and Modular Representation Theory Seminar

Microlocal sheaves on certain affine Springer fibers
3:00pm|Simonyi Hall 101 and Remote Access

For homogeneous affine Springer fibers (those with $G_m$ symmetry), we realize them as Lagrangian cycles inside ambient symplectic varieties, and make sense of microlocal sheaves supported on these affine Springer fibers. We also propose a...

Apr
13
2021

SL2 Seminar

Meldings and the codimension-three conjecture
Kari Vilonen
6:00pm|Remote Access

I will start by recalling the notion of microlocal perverse sheaves and then briefly explain meldings. The rest of the talk is devoted to explaining the ideas involved in the proof of the codimension-three conjecture.

Apr
08
2021

Quantum Groups Seminar

Representations of quantum groups at roots of 1
4:00pm|Remote Access

We discuss modular representations of reductive algebraic groups and then proceed to representations of quantum groups at roots of unity

Apr
07
2021

Geometric and Modular Representation Theory Seminar

K-Motives and Koszul Duality in Geometric Representation Theory
Jens Eberhardt
3:00pm|Simonyi Hall 101 and Remote Access

Perverse sheaves and intersection cohomology are central objects in geometric representation theory. This talk is about their long-lost K-theoretic cousins, called K-motives. We will discuss definitions and basic properties of K-motives and explore...