Commutative avatars of representations of semisimple Lie groups

Here we announce the construction and properties of a big commutative subalgebra of the Kirillov algebra, called big algebra, attached to a finite dimensional irreducible representation of a complex semisimple Lie group. They are commutative finite flat algebras over the cohomology of the classifyin...

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Bibliographic Details
Published in:arXiv.org 2024-09
Main Author: Hausel, Tamás
Format: Article
Language:English
Subjects:
Algebra
Group theory
Homology
Intersections
Lie groups
Polynomials
Ring structures
Online Access:Get full text
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Summary:Here we announce the construction and properties of a big commutative subalgebra of the Kirillov algebra, called big algebra, attached to a finite dimensional irreducible representation of a complex semisimple Lie group. They are commutative finite flat algebras over the cohomology of the classifying space of the group. They are isomorphic with the equivariant intersection cohomology of affine Schubert varieties, endowing them with a new ring structure. Study of the finer aspects of the structure of the big algebras will also furnish the stalks of the intersection cohomology with ring structure, thus ringifying Lusztig's q-weight multiplicity polynomials i.e. affine Kazhdan-Lusztig polynomials.
ISSN:2331-8422
DOI:10.48550/arxiv.2311.02711