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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

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Date:
March 15, 2021
Time:
3:00 pm - 4:00 pm EDT
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