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arXiv 2106.11706math.QAmath-phmath.MP
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关于公平型$U_q(\widehat{sl_2})$积极部分的第二次实现

On the second realization for the positive part of $U_q(\widehat{sl_2})$ of equitable type

Pascal Baseilhac

摘要:

考虑了量子代数$U_q(\widehat{sl_2})$的公平表示.这个介绍最初是由T. Ito和P. Terwilliger。本文继Terwilliger的近期工作之后,引入并研究了等价型$U_q^{IT,+}$的$U_q(\widehat{sl_2})$的(非标准)正部分及其第二实现(现代数)$U_q^{T,+}$.利用满足Freidel-Maillet型方程的K算子及其量子行列式的条件,给出了$U_q^{T,+}$的表示.考虑了K-算子的Ding-Frenkel L-算子实现,由此导出了从$U_q^{T,+}$到$U_q(\widehat{sl_2})$的Drinfeld第二实现的子代数(当前代数)的显式单同态,并刻画了$U_q^{T,+}$的余同态代数结构.利用Freidel-Maillet代数的框架描述了$U_q^{T,+}$的中心扩张及其与Drinfeld的$U_q(\widehat{gl_2})$的第二实现的关系.

英文摘要:

The equitable presentation of the quantum algebra $U_q(\widehat{sl_2})$ is considered. This presentation was originally introduced by T. Ito and P. Terwilliger. In this paper, following Terwilliger's recent works the (nonstandard) positive part of $U_q(\widehat{sl_2})$ of equitable type $U_q^{IT,+}$ and its second realization (current algebra) $U_q^{T,+}$ are introduced and studied. A presentation for $U_q^{T,+}$ is given in terms of a K-operator satisfying a Freidel-Maillet type equation and a condition on its quantum determinant. Realizations of the K-operator in terms of Ding-Frenkel L-operators are considered, from which an explicit injective homomorphism from $U_q^{T,+}$ to a subalgebra of Drinfeld's second realization (current algebra) of $U_q(\widehat{sl_2})$ is derived, and the comodule algebra structure of $U_q^{T,+}$ is characterized. The central extension of $U_q^{T,+}$ and its relation with Drinfeld's second realization of $U_q(\widehat{gl_2})$ is also described using the framework of Freidel-Maillet algebras.

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