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arXiv 0803.0362math.RTmath-phmath.COmath.MPmath.QA
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Q-系作为簇代数II:有限型Cartan矩阵及其多项式性质

Q-systems as cluster algebras II: Cartan matrix of finite type and the polynomial property

Philippe Di Francesco, Rinat Kedem

摘要:

对于任意简单李代数g,我们定义了与量子仿射代数$U_q(\hat{\g})$的Kirillov-Reshetikhin特征标的Q系统相关的簇代数,推广了[Kedem 2007]中处理的简单情况。我们描述了这个簇代数的一些特殊性质,并解释了它与组合KR猜想证明中出现的变形Q-系统的关系。我们证明了多项式的集群变量的“初始集群种子”,包括解决方案的Q-系统,是一个后果的劳伦特现象和边界条件。我们也给出了Q-系统和广义T-系统作为带系数的簇代数的一个公式。这就证明了在适当的边界条件下广义T-系统解的多项式性。

英文摘要:

We define the cluster algebra associated with the Q-system for the Kirillov-Reshetikhin characters of the quantum affine algebra $U_q(\hat{\g})$ for any simple Lie algebra g, generalizing the simply-laced case treated in [Kedem 2007]. We describe some special properties of this cluster algebra, and explain its relation to the deformed Q-systems which appeared on our proof of the combinatorial-KR conjecture. We prove that the polynomiality of the cluster variables in terms of the ``initial cluster seeds'', including solutions of the Q-system, is a consequence of the Laurent phenomenon and the boundary conditions. We also give a formulation of both Q-systems and generalized T-systems as cluster algebras with coefficients. This provides a proof of the polynomiality of solutions of generalized T-systems with appropriate boundary conditions.

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