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arXiv 1608.01423math.QAmath.RAmath.RT
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量子仿射GL_n的乘法公式和正则基

Multiplicaton formulas and canonical basis for quantum affine gl_n

Jie Du, Zhonghua Zhao

摘要:

我们将给出\cite [Thm~4.5]{DuFu 2015 quantum}中循环群$Δ(n)$的Ringel-Hall代数${\frak H}_Δ(n)$中乘法公式的表示论证明.作为第一个应用,我们立即看到存在的霍尔多项式的循环箭图,一个事实建立在\cite{Guo1995hallpoly}和\cite{Ringel1993composition},并推导出一个递归公式来计算它们。我们将进一步利用\cite{DengDuXiao2007generic}中给出的${\mathfrak H}_Δ(n)$的公式和某些单项式基的构造,以及量子圈代数$U_v(\hat{gl}_n)$在\cite{DengDuFu2012double}中的双Ringel-Hall代数实现,来发展一些算法和计算$U_v(\hat{gl}_n)^+$的正则基.作为例子,我们将明确地显示与量子群$U_v(\hat{gl}_n)$的Lowey长度至多为$2$的模相关的正则基的一部分。

英文摘要:

We will give a representation-theoretic proof for the multiplication formula in the Ringel-Hall algebra ${\frak H}_Δ(n)$ of a cyclic quiver $Δ(n)$ given in \cite[Thm~4.5]{DuFu2015quantum}. As a first application, we see immediately the existence of Hall polynomials for cyclic quivers, a fact established in \cite{Guo1995hallpoly} and \cite{Ringel1993composition}, and derive a recursive formula to compute them. We will further use the formula and the construction of certain monomial base for ${\mathfrak H}_Δ(n)$ given in \cite{DengDuXiao2007generic}, together with the double Ringel--Hall algebra realisation of the quantum loop algebra $U_v(\hat{gl}_n)$ in \cite{DengDuFu2012double}, to develop some algorithms and to compute the canonical basis for $U_v(\hat{gl}_n)^+$. As examples, we will show explicitly the part of the canonical basis associated with modules of Lowey length at most $2$ for the quantum group $U_v(\hat{gl}_n)$.

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