Whittaker functions and Demazure characters

p-进域上$GL(n)$的Steinberg表示的Whittaker函数

Whittaker functions for Steinberg representations of $GL(n)$ over a $p$-adic field

本文通过确定Iwahori Hecke代数特征标在特定元素上的取值，完整计算了p-进域上$GL(n)$的广义Steinberg表示的Whittaker函数，并证明该表示限制到$SL_n(F)$上仍不可约，推广了Baruch-Purkait关于$GL_2(F)$的结果。

余正则对称对的 Whittaker 归纳的局部扭曲迹公式：几何侧

A local twisted trace formula for Whittaker induction of coregular symmetric pairs: the geometric side

本文建立余正则对称对 Whittaker 归纳的局部扭曲迹公式几何侧及拟特征标正则芽公式，并推出强尖点测试函数下的局部迹公式、模型重数公式及 L-包相关应用。

Mellin transforms of p-adic Whittaker functions

It is shown that Mellin transforms of p-adic Whittaker functions exist for generic characters. For good choices of vectors they are rational functions. For class one vectors they can be calculated explicitly. It turns out that they are automorphic L-factors times normalization factors.

An explicit inversion formula for the $p$-adic Whittaker transform on $\text{GL}_n(\mathbb{Q}_p)$

Whittaker functions on non-archimedean fields were first introduced in the work of Jacquet, and they were characterized explicitly by Shintani. We obtain an explicit inversion formula and a Plancherel formula for the $p$-adic Whittaker transform on $\text{GL}_n(\mathbb{Q}_p)$. As an application, integral representations are obtained for the local factors of certain symmetric power $L$-functions.

Non-Archimedean Whittaker functions as characters: a probabilistic approach to the Shintani-Casselman-Shalika formula

For a reductive group $G$ over a non-Archimedean local field (e.g $GL_n( \mathbb{Q}_p )$ ), Jacquet's Whittaker function is essentially proportional to a character of an irreducible representation of the Langlands dual group $G^\vee( \mathbb{C} )$ ( a Schur function if $G = GL_n( \mathbb{Q}_p )$). We propose a probabilistic approach to this claim, known as the Shintani-Casselman-Shalika formula, when the group $G$ has at least one minuscule cocharacter in the coweight lattice. Our presentation goes along the following lines. Thanks to a minuscule random walk $W^{(z)}$ on the coweight lattice a…

On Certain Degenerate Whittaker Models for Cuspidal Representations of $\mathrm{GL}_{k\cdot n}\left(\mathbb{F}_q\right)$

Let $π$ be an irreducible cuspidal representation of $\mathrm{GL}_{kn}\left(\mathbb{F}_q\right)$. Assume that $π= π_θ$, corresponds to a regular character $θ$ of $\mathbb{F}_{q^{kn}}^{*}$. We consider the twisted Jacquet module of $π$ with respect to a non-degenerate character of the unipotent radical corresponding to the partition $(n^k)$ of $kn$. We show that, as a $\mathrm{GL}_{n}\left(\mathbb{F}_q\right)$-representation, this Jacquet module is isomorphic to $π_{θ\upharpoonright_{\mathbb{F}_n^*}} \otimes \mathrm{St}^{k-1}$, where $\mathrm{St}$ is the Steinberg representation of $\mathrm{GL}…

Symmetric genuine Spherical Whittaker functions on the metaplectic double cover of GSp(2n,F)

Let F be a p-adic field of odd residual characteristic. Let G(n) and G`(n) be the metaplectic double covers of the general symplectic group and the symplectic group attached to the 2n dimensional symplectic space over F. Let T be a genuine, possibly reducible, unramified principal series representation of G(n). In these notes we give an explicit formulas for a spanning set for the space of Spherical Whittaker functions attached to T. For odd n, and generically for even n, this spanning set is a basis. The signicant property of this set is that each of its elements is unchanged under the action…

从高秩诱导Whittaker函数

Inducing Whittaker Functions from Higher Ranks

本文通过限制高秩Whittaker函数到块对角嵌入，构造了低秩Whittaker函数，并给出了参数条件，实现了从GL(n,R)到GL(m,R)的直接诱导。

Metaplectic Ice

Spherical Whittaker functions on the metaplectic n-fold cover of GL(r+1) over a nonarchimedean local field containing n distinct n-th roots of unity may be expressed as the partition functions of statistical mechanical systems that are variants of the six-vertex model. If n=1 then in view of the Casselman-Shalika formula this fact is related to Tokuyama's deformation of the Weyl character formula. It is shown that various properties of these Whittaker functions may be expressed in terms of the commutativity of row transfer matrices for the system. Potentially these properties (which are alread…