Hecke algebras of simply-laced type with independent parameters

Huang, Jia

doi:10.5802/alco.108

Huang, Jia ¹

¹ University of Nebraska at Kearney Department of Mathematics and Statistics Kearney, Nebraska 68849, USA

Algebraic Combinatorics, Volume 3 (2020) no. 3, pp. 667-691.

Abstract

We study the (complex) Hecke algebra $ℋ_{S} (q)$ of a finite simply-laced Coxeter system $(W, S)$ with independent parameters $q \in {(ℂ ∖ {roots of unity})}^{S}$ . We construct its irreducible representations and projective indecomposable representations. We obtain the quiver of this algebra and determine when it is of finite representation type. We provide decomposition formulas for induced and restricted representations between the algebra $ℋ_{S} (q)$ and the algebra $ℋ_{R} (q |_{R})$ with $R \subseteq S$ . Our results demonstrate an interesting combination of the representation theory of finite Coxeter groups and their 0-Hecke algebras, including a two-sided duality between the induced and restricted representations.

Received: 2019-03-11
Revised: 2019-12-27
Accepted: 2019-12-28
Published online: 2020-06-02

Zbl

DOI: 10.5802/alco.108

Classification: 16G30, 05E10
Keywords: Hecke algebra, independent parameters, simply-laced Coxeter system, induction and restriction, duality.

Author's affiliations:

Huang, Jia ¹

¹ University of Nebraska at Kearney Department of Mathematics and Statistics Kearney, Nebraska 68849, USA

License:

CC-BY 4.0

Copyrights: The authors retain unrestricted copyrights and publishing rights

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Huang, Jia. Hecke algebras of simply-laced type with independent parameters. Algebraic Combinatorics, Volume 3 (2020) no. 3, pp. 667-691. doi : 10.5802/alco.108. https://alco.centre-mersenne.org/articles/10.5802/alco.108/

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