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arXiv 2408.09712math.QAmath-phmath.MPmath.RT
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椭圆量子群的Gelfand-Tsetlin基

Gelfand-Tsetlin Bases for Elliptic Quantum Groups

Hitoshi Konno, Kohei Motegi

AI总结:

本研究针对椭圆量子群$U_{q,p}(\widehat{\mathfrak{gl}}_N)$的0级表示,给出有限维不可约表示的分类定理,构造两种Gelfand-Tsetlin基并建立联系,还得到二维方格模型配分函数的显式公式。

摘要:

我们研究椭圆量子群$U_{q,p}(\u2062\widehat{\mathfrak{gl}}_N)$的0级表示。我们借助量子仿射代数$U_q(\widehat{\mathfrak{gl}}_N)$的Drinfeld多项式的θ函数类似物,给出了$U_{q,p}(\widehat{\mathfrak{gl}}_N)$有限维不可约表示的分类定理。我们还参考Nazarov-Tarasov关于Yangian $Y(\mathfrak{gl}_N)$模的工作,构造了0级$U_{q,p}(\widehat{\mathfrak{gl}}_N)$模的Gelfand-Tsetlin基,这是一种基于Drinfeld生成元的构造。对于向量表示的张量积情形,我们借助$L$算子给出了Gelfand-Tsetlin基的另一种构造,并建立了两种构造之间的联系。我们还将它们与第一作者利用椭圆动力学$R$矩阵在标准基上实现的$\mathfrak{S}_n$作用得到的基进行了比较。作为副产品,我们得到了对应二维方格模型配分函数的显式公式,该公式用$A_{N-1}$型椭圆权函数表示。

英文摘要:

We study the level-0 representations of the elliptic quantum group $U_{q,p}(\widehat{\mathfrak{gl}}_N)$. We give a classification theorem of the finite-dimensional irreducible representations of $U_{q,p}(\widehat{\mathfrak{gl}}_N)$ in terms of the theta function analogue of the Drinfeld polynomial for the quantum affine algebra $U_q(\widehat{\mathfrak{gl}}_N)$. We also construct the Gelfand-Tsetlin bases for the level-0 $U_{q,p}(\widehat{\mathfrak{gl}}_N)$-modules following the work by Nazarov-Tarasov for the Yangian $Y(\mathfrak{gl}_N)$-modules. This is a construction in terms of the Drinfeld generators. For the case of tensor product of the vector representations, we give another construction of the Gelfand-Tsetlin bases in terms of the $L$-operators and make a connection between the two constructions. We also compare them with those obtained by the first author by using the $\mathfrak{S}_n$-action realized by the elliptic dynamical $R$-matrix on the standard bases. As a byproduct, we obtain an explicit formula for the partition functions of the corresponding 2-dimensional square lattice model in terms of the elliptic weight functions of type $A_{N-1}$.

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