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arXiv 1201.2128math.COmath.AG
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仿射对偶等价与k-Schur函数

Affine dual equivalence and k-Schur functions

Sami Assaf, Sara Billey

摘要:

k-Schur函数首先由Lapointe,Lascoux和Morse(2003)引入,希望将麦克唐纳多项式的展开细化为Schur函数。最近,Lam,Lapointe,Morse,and Shimozono(2010)给出了k-Schur函数的另一种定义,作为星形强表的加权生成函数,其对应于仿射对称群模对称群上的Bruhat阶标记饱和链。这个定义已经被证明对应于Lam(2008)的A型仿射格拉斯曼的舒伯特基,并且在t = 1时,它等价于Lapointe和Morse(2007)的k-表特征。本文将Haiman(1992)关于标准Young表的对偶等价关系推广到全星强表.基本等价关系可以被解释为图中的标记边,这些标记边共享Assaf对偶等价图的许多性质。这些图显示了k-舒尔函数的复杂性和仿射对称群模对称群的区间结构。我们引进的概念,扁平化和挤压斜星强tableaux在类比jeu大taquin幻灯片,以给出一种方法来找到所有同构类型的仿射对偶等价图的秩4。最后,我们通过比较这些函数的图形,将k-Schur函数与LLT和Macdonald多项式联系起来。

英文摘要:

The k-Schur functions were first introduced by Lapointe, Lascoux and Morse (2003) in the hopes of refining the expansion of Macdonald polynomials into Schur functions. Recently, an alternative definition for k-Schur functions was given by Lam, Lapointe, Morse, and Shimozono (2010) as the weighted generating function of starred strong tableaux which correspond with labeled saturated chains in the Bruhat order on the affine symmetric group modulo the symmetric group. This definition has been shown to correspond to the Schubert basis for the affine Grassmannian of type A by Lam (2008), and, at t = 1, it is equivalent to the k-tableaux characterization of Lapointe and Morse (2007). In this paper, we extend Haiman's (1992) dual equivalence relation on standard Young tableaux to all starred strong tableaux. The elementary equivalence relations can be interpreted as labeled edges in a graph which share many of the properties of Assaf's dual equivalence graphs. These graphs display much of the complexity of working with k-Schur functions and the interval structure on affine Symmetric Group modulo the Symmetric Group. We introduce the notions of flattening and squashing skew starred strong tableaux in analogy with jeu da taquin slides in order to give a method to find all isomorphism types for affine dual equivalence graphs of rank 4. Finally, we make connections between k-Schur functions and both LLT and Macdonald polynomials by comparing the graphs for these functions.

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