Between the sheets: rigid nilpotent elements in modular Lie algebras

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• David Stewart (University of Newcastle upon Tyne)
• Tuesday 28 January 2020, 14:45-15:35
• Seminar Room 1, Newton Institute.

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GRAW02 - Computational and algorithmic methods

(Joint with Sasha Premet) Let G be a reductive algebraic group over an algebraically closed field. Lusztig and Spaltenstein provided a method for inducing a nilpotent orbit from a Levi subgroup to the group G. Any orbit not obtained from a proper Levi subgroup is called rigid. These were classified by Kempken (for G classical) and Elashvili (for G exceptional). The latter was double-checked computationally by De Graaf. It turns out that this classification remains valid in characteristic p. I will explain the proof of this, obtained by extending the Borho-Kraft description of the sheets of the Lie algebra to positive characteristic and supported by a few computer calculations.

This talk is part of the Isaac Newton Institute Seminar Series series.

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