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arXiv 2102.07407math.QA
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量子群中心的显式生成元和关系

Explicit generators and relations for the centre of the quantum group

Yanmin Dai, Yang Zhang

摘要:

对于与单李代数$\mathfrak{g}$相关联的标准Drinfeld-Jimbo量子群${\rm U}_q(\mathfrak{g})$,构造了中心$Z({\rm U}_q(\mathfrak{g}))$的显式生成元,并确定了生成元所满足的关系.对于类型为$A_n(n\geq 2)$、$D_{2k+1}(k\geq 2)$或$E_6$的$\mathfrak{g}$,中心$Z({\rm U}_q(\mathfrak{g}))$同构于多元多项式代数的商,其在所有情况下以统一的方式描述。对于任何其他类型的$\mathfrak{g}$,$Z({\rm U}_q(\mathfrak{g}))$由$n=$对$(\mathfrak{g})$代数独立元素进行排序而生成。

英文摘要:

For the standard Drinfeld-Jimbo quantum group ${\rm U}_q(\mathfrak{g})$ associated with a simple Lie algebra $\mathfrak{g}$, we construct explicit generators of the centre $Z({\rm U}_q(\mathfrak{g}))$, and determine the relations satisfied by the generators. For $\mathfrak{g}$ of type $A_n(n\geq 2)$, $D_{2k+1}(k\geq 2)$ or $E_6$, the centre $Z({\rm U}_q(\mathfrak{g}))$ is isomorphic to a quotient of a polynomial algebra in multiple variables, which is described in a uniform manner for all cases. For $\mathfrak{g}$ of any other type, $Z({\rm U}_q(\mathfrak{g}))$ is generated by $n=$rank$(\mathfrak{g})$ algebraically independent elements.

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