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arXiv 2109.12908math.COmath.RT
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关于$A$型Whittaker函数的三个组合公式

Relating three combinatorial formulas for type $A$ Whittaker functions

Cristian Lenart, James Sidoli

摘要:

本文研究了$A$型球面Whittaker函数的几个组合公式之间的关系。这些是$p$ -adic群上的球函数,它们出现在自守形式理论中。它们依赖于参数$t$,并且是麦克唐纳多项式的特殊化,并且在设置$t=0$时进一步特殊化为舒尔多项式。这些多项式有三种类型的公式。第一个公式是在所谓的壁龛散步,工程在任意李型,并来自拉姆-叶公式麦克唐纳多项式。第二个是在某些填充的杨图,是来自,或类似于Haglund-Haiman-Loehr公式的麦克唐纳多项式。第三个公式是根据经典的半标准杨氏图。我们研究的方式,其中每个这样的公式是从前一个通过合并条款$-$一种现象称为压缩。没有这样的结果存在的情况下,惠特克功能。

英文摘要:

In this work we study the relationship between several combinatorial formulas for type $A$ spherical Whittaker functions. These are spherical functions on $p$-adic groups, which arise in the theory of automorphic forms. They depend on a parameter $t$, and are a specialization of Macdonald polynomials, and further specialize to Schur polynomials upon setting $t=0$. There are three types of formulas for these polynomials. The first formula is in terms of so-called alcove walks, works in arbitrary Lie type, and is derived from the Ram-Yip formula for Macdonald polynomials. The second one is in terms of certain fillings of Young diagrams, and is derived from, or is analogous to the Haglund-Haiman-Loehr formula for Macdonald polynomials. The third formula is in terms of the classical semistandard Young tableaux. We study the way in which each such formula is obtained from the previous one by combining terms $-$ a phenomenon called compression. No such results existed in the case of Whittaker functions.

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