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arXiv · 2505.18599

Harish-Chandra Theorem for the Multi-Parameter Quantum Groups of Okado-Yamane Type

Kaixiang Chen·Naihong Hu·Hengyi Wang
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Abstract

This paper is devoted to studying the centre of the multi-parameter quantum group $U_{q,G}(\mathfrak{g})$ introduced by Okado and Yamane, where $\mathfrak{g}$ is a complex simple Lie algebra, and all parameters lie in general position. We mainly establish the Harish-Chandra theorem, proving that the Harish-Chandra homomorphism is an isomorphism; in particular, we determine the centre $Z(U_{q,G})\cong (U^0_\flat)^W$ is isomorphic to a polynomial algebra or a quotient algebra of a polynomial algebra. The same result holds for the $(U^0_\flat)^W$ of the two-parameter quantum group $U_{r,s}(\mathfrak{g})$.

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Kaixiang Chen, Naihong Hu, Hengyi Wang. 2025-05-24. Harish-Chandra Theorem for the Multi-Parameter Quantum Groups of Okado-Yamane Type. https://arxiv.org/abs/2505.18599

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