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Seminar

GRTA seminar: On dimension growth of irreducible representations of semisimple Lie algebras in characteristic p March 27, 2018 (02:00 PM PDT - 03:00 PM PDT)
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Location: MSRI: Simons Auditorium
Speaker(s) Ivan Loseu (Northeastern University)
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In this talk (based on a joint work with Bezrukavnikov) I will discuss the representation theory of semisimple Lie algebras g in very large positive characteristic p. It is classically known that the universal enveloping algebra is a free finite rank module over its central subalgebra known as the p-center. This subalgebra is a copy of the symmetric algebra of the initial Lie algebra (with Frobenius twist). In particular, all irreducible representations are finite dimensional and have a p-character, an element of g. A particularly interesting case is when the p-character is nilpotent. It is known after Bezrukavnikov and collaborators that the set of simples with nilpotent p-character is independent of p and the dimensions are polynomials in p as long as p is sufficiently large. In this talk I will explain how to compute the degrees of these dimension polynomials. This result has applications to the classification of finite dimensional irreducible representations of finite W-algebras and to the theory of real stability conditions due to Bezrukavnikov and collaborators.

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