Decomposition numbers for unipotent blocks with small sl_2-weight in finite classical groups

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• Emily Norton (Kent)
• Thursday 26 October 2023, 15:00-16:00
• LG06 Old Gym.

If you have a question about this talk, please contact Chris Parker.

There are many familiar module categories admitting a categorical action of a Lie algebra. The combinatorial shadow of such an action often yields answers to module-theoretic questions, for instance via crystals. In proving a conjecture of Gerber, Hiss, and Jacon, it was shown by Dudas, Varagnolo, and Vasserot that the category of unipotent representations of a finite classical group has such a categorical action. In this talk I will explain how we can use the categorical action to deduce closed formulas for certain families of decomposition numbers of these groups. This is joint work in progress with Olivier Dudas.

This talk is part of the Algebra seminar series.

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• Algebra seminar
• LG06 Old Gym
• School of Mathematics events

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