Petar Bakic, Gordan Savin
Let $G$ be a $p$-adic classical group. The representations in a given Bernstein component can be viewed as modules for the corresponding Hecke algebra---the endomorphism algebra of a pro-generator of the given component. Using Heiermann's construction of these algebras, we describe the Bernstein components of the Gelfand--Graev representation for $G=$SO$(2n+1)$.
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We study the endomorphism algebras of a modular Gelfand-Graev representation of a finite reductive group by investigating modular properties of homomorphisms constructed by Curtis and Curtis-Shoji.
We consider the analog of Gelfand-Graev representations of the uniteriangular group. We obtain the decomposition into the sum of irreducible representations, prove that these representations are multiplicity free, calculate the Hecke algebra.}
Let $G$ be a connected reductive algebraic group defined over a finite field with $q$ elements. In the 1980's, Kawanaka introduced generalised Gelfand-Graev representations of the finite group $G(F_q)$, assuming that $q$ is a power of a good prime for $G$. These representations have turned out to be extremely useful in various contexts. Here we investigate to what extent Kawanaka's construction can be carried out when we drop the assumptions on~$q$. As a curious by-product, we obtain a new, conjectural characterisation of Lusztig's concept of special unipotent classes of $G$ in terms of weight…
On Gelfand pairs and degenerate Gelfand-Graev modules of General Linear groups of degree two over principal ideal local rings of finite length
本文研究有限长度奇特征剩余域主理想局部环上二阶一般线性群，证明其与上三角Borel子群构成强Gelfand对，刻画重数与剩余域基数无关的退化Gelfand-Graev模，并给出长度不超过4的环上所有该类模的完整分解。
For a connected reductive group $G$ defined over $\mathbb{F}_q$ and equipped with the induced Frobenius endomorphism $F$, we study the relation among the following three $\mathbb{Z}$-algebras: (i) the $\mathbb{Z}$-model $\mathsf{E}_G$ of endomorphism algebras of Gelfand-Graev representations of $G^F$; (ii) the Grothendieck group $\mathsf{K}_{G^\ast}$ of the category of representations of $G^{\ast F^\ast}$ over $\overline{\mathbb{F}_q}$ (Deligne-Lusztig dual side); (iii) the ring $\mathsf{B}_{G^\vee}$ of the scheme $(T^\vee/\!\!/ W)^{F^\vee}$ over $\mathbb{Z}$ (Langlands dual side). The compari…
On endomorphism algebras of Gelfand-Graev representations II
该研究针对特征p的有限域上的连通约化群G，证明了在坏素数乘积M取逆后的环上，G(F_q)的Gelfand-Graev表示的自同态环同构于其对偶群G*(F_q)的有限维F_q̄表示范畴的Grothendieck环。
Gelfand-Graev characters and their degenerate counterparts have an important role in the representation theory of finite groups of Lie type. Using a characteristic map to translate the character theory of the finite unitary groups into the language of symmetric functions, we study degenerate Gelfand-Graev characters of the finite unitary group from a combinatorial point of view. In particular, we give the values of Gelfand-Graev characters at arbitrary elements, recover the decomposition multiplicities of degenerate Gelfand-Graev characters in terms of tableau combinatorics, and conclude with …
Using Deodhar's decomposition of a double Schubert cell, we study the regular representations of finite groups of Lie type arising in the cohomology of Deligne-Lusztig varieties associated to tori. We deduce that the Deligne-Lusztig restriction of a Gelfand-Graev module is a shifted Gelfand-Graev module.
For a connected reductive algebraic group $G$ defined over a finite field $\mathbb F_q$, Kawanaka introduced the generalized Gelfand-Graev representations (GGGRs for short) of the finite group $G(\mathbb F_q)$ in the case where $q$ is a power of a good prime for $G$. This representation has been widely studied and used in various contexts. Recently, Geck proposed a conjecture, characterizing Lusztig's special unipotent classes in terms of weighted Dynkin diagrams. Based on this conjecture, he gave a guideline for extending the definition of GGGRs to the case where $q$ is a power of a bad prime…
Introduced by Kawanaka in order to find the unipotent representations of finite groups of Lie type, generalized Gelfand--Graev characters have remained somewhat mysterious. Even in the case of the finite general linear groups, the combinatorics of their decompositions has not been worked out. This paper re-interprets Kawanaka's definition in type $A$ in a way that gives far more flexibility in computations. We use these alternate constructions to show how to obtain generalized Gelfand--Graev representations directly from the maximal unipotent subgroups. We also explicitly decompose the corresp…
Iwahori component of the Gelfand--Graev representation for reductive groups
研究p-adic域上连通可约群的Gelfand-Graev表示的Iwahori分量，证明其与Hecke代数和符号表示的同构关系，扩展了Chan-Savin定理的应用范围。
We study the Iwahori-component of the Gelfand-Graev representation of a central cover of a split linear reductive group and utilize our results for three applications. In fact, it is advantageous to begin at the pro-$p$ level. Thus to begin we study the structure of a genuine pro-$p$ Iwahori-Hecke algebra, establishing Iwahori-Matsumoto and Bernstein presentations. With this structure theory we first describe the pro-$p$ part of the Gelfand-Graev representation and then the more subtle Iwahori part. For the first application we relate the Gelfand-Graev representation to the metaplectic represe…
Let G be a complex semisimple group and U its maximal unipotent subgroup. We study the algebra D(G/U) of algebraic differential operators on G/U and also its quasi-classical counterpart: the algebra of regular functions on the cotangent bundle. A long time ago, Gelfand and Graev have constructed an action of the Weyl group on D(G/U) by algebra automorphisms. The Gelfand-Graev construction was not algebraic, it involved analytic methods in an essential way. We give a new algebraic construction of the Gelfand-Graev action, as well as its quasi-classical counterpart. Our approach is based on Hami…
Let $\mathbf{G}$ be a connected reductive algebraic group over an algebraic closure $\overline{\mathbb{F}_p}$ of the finite field of prime order $p$ and let $F : \mathbf{G} \to \mathbf{G}$ be a Frobenius endomorphism with $G = \mathbf{G}^F$ the corresponding $\mathbb{F}_q$-rational structure. One of the strongest links we have between the representation theory of $G$ and the geometry of the unipotent conjugacy classes of $\mathbf{G}$ is a formula, due to Lusztig, which decomposes Kawanaka's Generalised Gelfand-Graev Representations (GGGRs) in terms of characteristic functions of intersection c…
Gelfand--Graev functor and quantum affine Schur--Weyl duality
本文揭示了中心覆盖的Gelfand--Graev模、Arnold--Brieskorn流形的Euler--Poincaré多项式与量子仿射Schur--Weyl对偶之间的联系，证明Gelfand--Graev函子与该对偶相关，且其Iwahori不动部分的交换代数是量子群的商。
We construct a Weyl group action on the DKS type varieties, a certain class of varieties associated with quivers. As a result, on some special DKS type varieties, we can give a quiver theoretic explanation of the quasi-classical Gelfand-Graev action discovered by Ginzburg and Riche and studied by Ginzburg and Kazhdan recently.
Gelfand--Graev representation as a Hecke algebra module of simple types of a finite central cover of $\mathrm{GL}(r)$
针对满足gcd(n,p)=1的非阿基米德局部域上一般线性群的n重覆盖，将Gelfand--Graev表示实现为单型Hecke代数模并给出显式表达式，推导得离散系列表示的Whittaker维数，结合Zelevinsky分类可理论上得到所有不可约表示的Whittaker维数。
Let $G$ be a finite reductive group defined over $\mathbb{F}_q$, with $q$ a power of a prime $p$. Motivated by a problem recently posed by C. Curtis, we first develop an algorithm to express each element of $G$ into a canonical form in terms of a refinement of a Bruhat decomposition, and we then use the output of the algorithm to explicitly determine the structure constants of the endomorphism algebra of a Gelfand-Graev representation of $G$ when $G=\mathrm{PGL}_3(q)$ for an arbitrary prime $p$, and when $G=\mathrm{SO}_5(q)$ for $p$ odd.
Local coefficients and Gelfand-Graev representations for non-split covers on SL(2)
本文推广 Krishnamurthy-Kutzko 的局部方法至 SL(2) 非分裂覆盖，计算 Langlands-Shahidi 局部系数，并研究 Gelfand-Graev 表示的代数结构，推广至无特征限制的非阿基米德局部域。
Let $G$ be a connected reductive algebraic group defined over the finite field $\F_q$, where $q$ is a power of a good prime for $G$, and let $F$ denote the corresponding Frobenius endomorphism, so that $G^F$ is a finite reductive group. Let $u \in G^F$ be a unipotent element and let $Γ_u$ be the associated generalised Gelfand-Graev representation of $G^F$. Under the assumption that $G$ has a connected centre, we show that the dimension of the endomorphism algebra of $Γ_u$ is a polynomial in $q$, with degree given by $\dim C_G(u)$. When the centre of $G$ is disconnected, it is impossible, in ge…
Let $G$ be a connected reductive group defined over a non-archimedean local field $F$. Let $B$ be a minimal $F$-parabolic subgroup with Levi factor $T$ and unipotent radical $U$. Let $ψ$ be a non-degenerate character of $U(F)$ and $λ$ a character of $T(F)$. Let $(K,ρ)$ be a Bushnell-Kutzko type associated to the Bernstein block of $G(F)$ determined by the pair $(T,λ)$. We study the $ρ$-isotypical component $(c\text{-ind}_{U(F)}^{G(F)}ψ)^ρ$ of the induced space $c\text{-ind}_{U(F)}^{G(F)}ψ$ of functions compactly supported mod $U(F)$. We show that $(c\text{-ind}_{U(F)}^{G(F)}ψ)^ρ$ is cyclic mod…
For the quantum algebra U_q(gl(n+1)) in its reduction on the subalgebra U_q(gl(n)) an explicit description of a Mickelsson-Zhelobenko reduction Z-algebra Z_q(gl(n+1),gl(n)) is given in terms of the generators and their defining relations. Using this Z-algebra we describe Hermitian irreducible representations of a discrete series for the noncompact quantum algebra U_q(u(n,1)) which is a real form of U_q(gl(n+1)), namely, an orthonormal Gelfand-Graev basis is constructed in an explicit form.
We introduce the notion of Gelfand pairs and zonal spherical functions for Iwahori-Hecke algebras.
Let $F$ be a nonarchimedean local field of characteristic 0 with residual characteristic $p$ and let $\ell$ be an odd prime with $2\ell<p$. We establish and explicitly compute the local stable transfer factor $Θ_ϕ$ in the sense of \cite{SetT} associated to a natural $L$-embedding $ϕ:{^LT}\to{^LG}$ for $G=\text{SL}_\ell$ for $\ell$ an odd prime and $T\subset G$ a maximal unramified elliptic torus defined over $F$. We also explicitly compute the associated stable transfer, answering in the affirmative the Questions A and B of \cite{SetT}. We do the same, explicitly computing the stable transfer …
In this note, we study irreducible unitary representations of special linear groups of lower ranks, in terms of the matrix models of Gelfand-Naimark and Gelfand-Graev. Review of existing literature is provided. We also add some new calculation based on existing theory.
The universal category $\mathcal{O}$ and the Gelfand-Graev action
将Soergel函子推广到万有BGG范畴，证明其通过非退化商分解并具有Weyl群的Gelfand-Graev作用，计算了万有情形下的核并推广到约化群作用的DG范畴，同时证明了G-范畴函子等价性的域值点判别准则。
With a view to determining character values of finite reductive groups at unipotent elements, we prove a number of results concerning inner products of generalised Gelfand-Graev characters with characteristic functions of character sheaves, here called Lusztig functions. These are used to determine projections of generalised Gelfand-Graev characters to the space of unipo- tent characters, and to the space of characters with a given wave front set. Such projections are expressed largely in terms of Weyl group data. We show how the values of characters at their unipotent support or wave front se…
Let $\mathbb{H}^{n}$ be the $(2n+1)$-dimensional Heisenberg group, and let $K$ be a compact subgroup of U(n), such that $(K,\mathbb{H}^{n})$ is a Gelfand pair. Also assume that the $K$-action on $\mathbb{C}^n$ is polar. We prove a Hecke-Bochner identity associated to the Gelfand pair $(K,\mathbb{H}^{n})$. For the special case $K=U(n)$, this was proved by Geller, giving a formula for the Weyl transform of a function $f$ of the type $f=Pg$, where $g$ is a radial function, and $P$ a bigraded solid U(n)-harmonic polynomial. Using our general Hecke-Bochner identity we also characterize (under some …
We prove a long-standing conjecture of Geck which predicts that cuspidal unipotent characters remain irreducible after $\ell$-reduction. To this end, we construct a progenerator for the category of representations of a finite reductive group coming from generalised Gelfand--Graev representations. This is achieved by showing that cuspidal representations appear in the head of generalised Gelfand--Graev representations attached to cuspidal unipotent classes, as defined and studied in \cite{GM96}.
For a locally compact, totally disconnected group $G$, a subgroup $H$ and a character $χ:H \to \mathbb{C}^{\times}$ we define a Hecke algebra $\mathcal{H}_χ$ and explore the connection between commutativity of $\mathcal{H}_χ$ and the $χ$-Gelfand property of $(G,H)$, i.e. the property $\mathrm{dim}_\mathbb{C}(ρ^*)^{(H,χ^{-1})} \leq 1$ for every $ρ\in \mathrm{Irr}(G)$, the irreducible representations of $G$. We show that the conditions of the Gelfand-Kazhdan criterion imply commutativity of $\mathcal{H}_χ$, and verify in several simple cases that commutativity of $\mathcal{H}_χ$ is equivalent to…
Quasiparabolic Gelfand models for finite irreducible Coxeter groups and their canonical Hecke structures
本文分类了有限不可约Coxeter群中由抛物子群诱导特征构造的拟抛物Gelfand模型，并推导了Gelfand对及典范Hecke结构。
In this paper we show, using Deligne-Lusztig theory and Kawanaka's theory of generalised Gelfand-Graev representations, that the decomposition matrix of the special linear and unitary group in non defining characteristic can be made unitriangular with respect to a basic set that is stable under the action of automorphisms.
Hecke combinatorics, Kåhrstr{ö}m's conditions and Kostant's problem
本文研究Hecke代数组合学，探讨与Kåhrstr{ö}m猜想相关的条件，该猜想涉及$\mathfrak{sl}_n$的BGG范畴$\mathcal{O}$中Kostant问题，并分析Kazhdan-Lusztig基生成的循环子模及左胞腔不变性。
We introduce an infinite-dimensional $p$-adic affine group and construct its irreducible unitary representation. Our approach follows the one used by Vershik, Gelfand and Graev for the diffeomorphism group, but with modifications made necessary by the fact that the group does not act on the phase space. However it is possible to define its action on some classes of functions.
Let $G$ be a general linear group over a $p$-adic field. It is well known that Bernstein components of the category of smooth representations of $G$ are described by Hecke algebras arising from Bushnell-Kutzko types. We describe the Bernstein components of the Gelfand-Graev representation of $G$ by explicit Hecke algebra modules. This result is used to translate the theory of Bernstein-Zelevinsky derivatives in the language of representations of Hecke algebras, where we develop a comprehensive theory.
Modular Gelfand pairs and multiplicity-free representations
本文推广 Gelfand 判据，证明任意特征代数闭域上 Gelfand 对与无重数表示定理，并用于 Whittaker 模型和三线性型唯一性。
Recursive structures of molecules and cells in Gelfand $S_n$-graphs
本文研究Gelfand $S_n$-graphs中分子和细胞的递归结构，通过引入递归结构并讨论其作用，证明特定分子确实是一个细胞。
Wavefront sets and descent method for finite unitary groups
本文针对有限酉群，证明了不可约表示的波前对应的广义Gelfand-Graev表示中该表示的重数为1，推广了经典结果，并给出分解算法及U4(Fq)的算例。
A combinatorial construction of a Gelafand model for the symmetric group and its Iwahori-Hecke algebra is presented.
Cell Classification of Gelfand $S_n$-Graphs
本文基于RSK-like算法对Gelfand $S_n$-图的分子进行分类，并证明每个分子都是细胞，从而完成细胞分类。
We introduce a class of equivalences, which we call generalized semi-infinite Hecke equivalences, between certain categories of representations of graded associative algebras which appear in the setting of semi-infinite cohomology for associative algebras and categories of representations of related algebras of Hecke type which we call semi-infinite Hecke algebras. As an application we obtain an equivalence between a category of representations of a non-twisted affine Lie algebra $\widehat{\mathfrak g}$ of level $-2h^\vee-k$, where $h^\vee$ is the dual Coxeter number of the underlying semisimp…
Fourier transforms on the basic affine space of a quasi-split group
本文把 Gelfand–Graev 关于基本仿射空间上广义 Fourier 变换的构造，由分裂群扩展到局部非阿基米德域上的拟分裂群。
A Gelfand model for an algebra is a module given by a direct sum of irreducible submodules, with every isomorphism class of irreducible modules represented exactly once. We introduce the notion of a perfect model for a finite Coxeter group, which is a certain set of discrete data (involving Rains and Vazirani's concept of a perfect involution) that parametrizes a Gelfand model for the associated Iwahori-Hecke algebra. We describe perfect models for all classical Weyl groups, excluding type D in even rank. The representations attached to these models simultaneously generalize constructions of A…
Let $G$ be a split reductive group over a $p$-adic field $F$. Let $B$ be a Borel subgroup and $U$ the maximal unipotent subgroup of $B$. Let $ψ$ be a Whittaker character of $U$. Let $I$ be an Iwahori subgroup of $G$. We describe the Iwahori-Hecke algebra action on the Gelfand-Graev representation $(\mathrm{ind}_{U}^{G}ψ)^I$ by an explicit projective module. As a consequence, for $G=GL(n,F)$, we define and describe Bernstein-Zelevinsky derivatives of representations generated by $I$-fixed vectors in terms of the corresponding Iwahori-Hecke algebra modules. Furthermore, using Lusztig's reduction…
We realize the non-split Bessel model of Novodvorsky and Piatetski-Shapiro as a generalized Gelfand-Graev representation of GSp(4), as suggested by Kawanaka. With uniqueness of the model already established by Novodvorsky and Piatetski-Shapiro, we establish existence of a Bessel model for unramified principal series representations. We then connect the Iwahori-fixed vectors in the Bessel model to a linear character of the Hecke algebra of GSp(4) following the method outlined more generally by Brubaker, Bump, and Friedberg. We use this connection to calculate the image of Iwahori-fixed vectors …
In this thesis, we investigate the asymptotics of random partitions chosen according to probability measures coming from the representation theory of the symmetric groups $S_n$ and of the finite Chevalley groups $GL(n,F_q)$ and $Sp(2n,F_q)$. More precisely, we prove laws of large numbers and central limit theorems for the $q$-Plancherel measures of type A and B, the Schur-Weyl measures and the Gelfand measures. Using the RSK algorithm, it also gives results on longest increasing subsequences in random words. We develop a technique of moments (and cumulants) for random partitions, thereby using…
Induced representations and harmonic analysis on finite groups
该研究针对有限群子群的不可约表示诱导得到的表示的交换子，结合Frobenius互反律构造正交基与Fourier变换，将结果推广到同构的Hecke代数并得到相关经典结果，最终建立Hecke代数的Gelfand-Tsetlin基理论。
Quantum wreath products and $p$-adic general linear group
本文提出量子 wreath 产品理论，用于研究 $p$-adic 一般线性群的 Hecke 代数及其模结构，并给出了相关 Schur 代数的结构理论和多个 $p$-adic 重要结果的代数证明。
Gelfand--Kirillov dimension and mod $p$ cohomology for inner forms of $\mathrm{GL}_2$
本文计算了内形式 $D^\times$ 的模 $p$ 上同调中海德克特征空间的格尔福恩-基里洛夫维数，并在 $D$ 在 $p$ 处为除环时给出了简化证明。
We describe the tensor products of two irreducible linear complex representations of the finite general linear group G = GL(3,q) in terms of induced representations by linear characters of maximal torii and also in terms of Gelfand-Graev representations. Our results include MacDonald's conjectures for G and at the same time they are extensions to G of finite counterparts to classical results on tensor products of holomorphic and anti-holomorphic representations of the group SL(2, R). Moreover they provide an easy way to decompose these tensor products, with the help of Frobenius reciprocity. W…
We study imaginary representations of the Khovanov-Lauda-Rouquier algebras of affine Lie type. Irreducible modules for such algebras arise as simple heads of standard modules. In order to define standard modules one needs to have a cuspidal system for a fixed convex preorder. A cuspidal system consists of irreducible cuspidal modules---one for each real positive root for the corresponding affine root system ${\tt X}_l^{(1)}$, as well as irreducible imaginary modules---one for each $l$-multipartition. We study imaginary modules by means of `imaginary Schur-Weyl duality'. We introduce an imagina…
Imaginary Schur-Weyl duality for quiver Hecke superalgebras
本文研究箭图 Hecke 超代数的虚尖代数，通过构造非负分次的 Morita 等价代数 C(n,d)，将其表示论归结为经典 Schur 代数，从而用多重分拆典范分类不可约模。
Rational wavefront sets and the descent method for finite classical groups
本文通过下降法完成有限域上经典群不可约表示波前集中有理幂零轨道的显式描述，并建立单幂表示波前集与Lusztig典范商的关系及Alvis-Curtis对偶。
Gelfand-Kirillov dimension and mod p cohomology for GL2
本文研究全实域上四元数代数情形下 GL2 的模 p Galois 表示，证明相应 Hecke 特征空间中许多可容许光滑表示具有 Gelfand-Kirillov 维数 [F_v:Q]。
Irreducible components of the moduli space of Langlands parameters
本文研究 p 进域上 Langlands 参数模空间的几何结构，确定其不可约分支，刻画驯分歧正则点附近的局部结构及其与 Gelfand–Graev 表示自同态环的联系，并给出 Levi 子群情形下自然模叠映射光滑的开稠密集合。
Tate cohomology of unipotent cuspidal representations of finite groups of Lie type
本文针对有限李型群的幂单尖顶表示，利用广义Gelfand-Graev表示与Harish-Chandra诱导构造的投射生成元的重数1性质，证明了特定Tate上同调群的不可约性与消失性。
The new approach to the theory of complex representrations of the finite symmetric groups which based on the notions of Coxeter generators., Gelfand-Zetlin algebras, Hecke algebra, Young-Jucys-Murphi generators and which hardly used inductive structure - is systematically developed. The appearence of Young diagrams, tables is naturally explained - the set of content vectors of all Young tables is the spectra of Gel'fand-Zetlin algebra. The first steps of the theory (the list of the irrediucible representatinos, branching rule, Young orthopgonal form, Murnagan-Nakayama rule etc.)are established…
Local Langlands in families: The banal case
提出了族中的局部 Langlands 对应猜想，关联了 p-进群表示范畴中心、Langlands 参数叠函数环与 Gelfand-Graev 表示自同态，并在反转特定整数后对经典 p-进群证明了该猜想。
Let $F$ be a totally real field unramified at all places above $p$ and $D$ be a quaternion algebra which splits at either none, or exactly one, of the infinite places. Let $\bar{r}:\mathrm{Gal}(\bar{F}/F)\to \mathrm{GL}_2(\bar{\mathbb{F}}_p)$ be a continuous irreducible representation which, when restricted to a fixed place $v|p$, is non-semisimple and sufficiently generic. Under some mild assumptions, we prove that the admissible smooth representations of $\mathrm{GL}_2(F_v)$ occurring in the corresponding Hecke eigenspaces of the mod $p$ cohomology of Shimura varieties associated to $D$ have…
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