10. Jun 2021

Spectra in representation theory

ALGEBRAIC GEOMETRY & NUMBER THEORY SEMINAR

Datum: 10. June 2021 | 09:00 – 11:00
Sprecher: Geordie Williamson, University of Sidney
Veranstaltungsort: https://mathseminars.org/seminar/AGNTISTA

In geometric representation theory cohomology, intersection cohomology and constructible sheaves show up everywhere. This might seem strange to an algebraic topologist, who might ask: why this emphasis on cohomology, when there are so many other interesting cohomology theories(like K-theory, elliptic cohomology, complex cobordism, …) out there? They might also ask: is there something like "intersection K-theory", or "intersection complex cobordism"? This is something I've often wondered about. I will describe work in progress with Ben Elias, where we use Soergel bimodules to investigate what KU-modules look like on the affine Grassmannian. We have checked by hand that in types A1, A2 and B2, one gets something roughly resembling the quantum group. Speaking very roughly, the intersection K-theory of Schubert varieties in the affine Grassmannian should recover the irreducible representations of the quantum group. Inspirations for this work include a strange Cartan matrix discovered by Ben Elias, and work of Cautis-Kamnitzer.