- This event has passed.
Cris Negron, UNC, Cohomology for Drinfeld doubles of finite group schemes
March 15, 2021 | 3:00 pm - 4:00 pm EDT
We consider a finite group scheme G, and its associated representation category rep G. Here one can think of a finite discrete group, or an infinitesimal group scheme, such as the kernel of the r-th Frobenius map for GL_n over F_p. Via a standard tensor categorical construction one has Drinfeld’s center Z(rep G) of the category of G-representations, which provides the universal central tensor functor Z(rep G) -> rep G. I will describe recent work in which we prove that cohomology for the center of rep G satisfies strong finiteness properties. In particular, the self-extension algebra of the unit 1 in Z(rep G) forms a finitely generated algebra over the base field, and for any other object V, extensions from 1 to V form a finitely generated module over this algebra. I will explain some of the mathematics behind this result, and also provide the relevant historical framing. Parts of this project are joint with Eric Friedlander.
Webpage for speaker: https://negron.math. unc.edu/
A Zoom link will be sent out to the Algebra and Combinatorics mailing list. If you would like to be added to the mailing list, please contact Corey Jones at cmjones6@ncsu.edu