Yuri Kondratiev
We introduce an infinite-dimensional 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.
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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.
We introduce and study the so-called serpentine representations of the infinite symmetric group $\sinf$, which turn out to be closely related to the basic representation of the affine Lie algebra $\widehat{\mathfrak{sl}_2}$ and representations of the Virasoro algebra. This is a new version of the manuscript of the same authors "On a relation between the basic representation of the affine Lie algebra $\widehat\sl$ and a Schur--Weyl representation of the infinite symmetric group" (arXiv:1403.1558)
We prove that there is a natural grading-preserving isomorphism of $\sl$-modules between the basic module of the affine Lie algebra $\widehat\sl$ (with the homogeneous grading) and a Schur--Weyl module of the infinite symmetric group $\sinf$ with a grading defined through the combinatorial notion of the major index of a Young tableau, and study the properties of this isomorphism. The results reveal new and deep interrelations between the representation theory of $\widehat\sl$ and the Virasoro algebra on the one hand, and the representation theory of $\sinf$ and the related combinatorics on the…
For an infinite Coxeter system, one can extend the weak right order to the set of infinite reduced words. This is called limit weak order. In [Transformation Groups 18(1), 2013, 179-231], Lam and Pylyavskyy showed that for affine Weyl groups of type $\widetilde{A}_n$ minimal infinite reduced words under the limit weak order are precisely those infinite Coxeter elements and asked the question of characterization, in terms of infinite reduced words, of the minimal elements of the limit weak order for other affine types. In this paper, we answer this question by characterizing the minimal infinit…
Infinite friezes of affine type D
该研究针对仿射型$D$丛范畴衍生的无限frieze展开，确定其增长系数，并证明所有由tube给出的仿射型$D$ frieze均具有一致的增长行为。
Finite dimensional representations of DAHA and affine Springers fibers : the spherical case
对有理双仿射Hecke代数的有限维单球面表示进行了分类，并研究了双仿射Hecke代数的一类显着的有限维单球面表示.
In this paper, we investigate various properties of strong and weak twisted Bruhat orders on a Coxeter group. In particular, we prove that any twisted strong Bruhat order on an affine Weyl group is locally finite, strengthening a result of Dyer in J. Algebra, 163, 861--879 (1994). We also show that for a non-finite and non-cofinite biclosed set $B$ in the positive system of an affine root system with rank greater than 2, the set of elements having a fixed $B$-twisted length is infinite. This implies that the twisted strong and weak Bruhat orders have an infinite antichain in those cases. Final…
Classification of the Irreducible Representations of Affine Hecke Algebras of Type B_2 with unequal parameters
本文对B_2型仿射Hecke代数的有限维不可约表示进行了分类。
In this article, we explain the main philosophy of 2-representation theory and quantum affine Schur-Weyl duality. The Khovanov-Lauda-Rouquier algebras play a central role in both themes.
We initiate the representation theory of the degenerate affine periplectic Brauer algebra on $n$ strands by constructing its finite-dimensional calibrated representations when $n=2$. We show that any such representation that is indecomposable and does not factor through a representation of the degenerate affine Hecke algebra occurs as an extension of two semisimple representations with one-dimensional composition factors; and furthermore, we classify such representations with regular eigenvalues up to isomorphism.
Affine Deligne-Lusztig varieties via the double Bruhat graph I: Semi-infinite orbits
本文引入双Bruhat图新语言，通过半无限轨道研究仿射Deligne-Lusztig簇的几何，克服了正则性条件限制。
We explore the modular representation theory of affine and cyclotomic Yokonuma-Hecke algebras. We provide an equivalence between the category of finite dimensional representations of the affine (resp. cyclotomic) Yokonuma-Hecke algebra and that of an algebra which is a direct sum of tensor products of affine Hecke algebras of type $A$ (resp. Ariki-Koike algebras). As one of the applications, the irreducible representations of affine and cyclotomic Yokonuma-Hecke algebras are classified over an algebraically closed field of characteristic $p$. Secondly, the modular branching rules for these alg…
In this paper, we study the relation between the cocenter and the representation theory of affine Hecke algebras. The approach is based on the interaction between the rigid cocenter, an important subspace of the cocenter, and the dual object in representation theory, the rigid quotient of the Grothendieck group of finite dimensional representations.
Extremal weight crystals over affine Lie algebras of infinite rank
本文利用Kwon旋量模型和Lecouvey表aux模型研究无限秩仿射李代数的极值权晶体，证明后者同构于零级极值权晶体，并据此阐明相关范畴Grothendieck环的代数结构。
We introduce semi-infinite Lakshmibai-Seshadri paths by using the semi-infinite Bruhat order (or equivalently, Lusztig's generic Bruhat order) on affine Weyl groups in place of the usual Bruhat order. These paths enable us to give an explicit realization of the crystal basis of an extremal weight module of an arbitrary level-zero dominant integral extremal weight over a quantum affine algebra. This result can be thought of as a full generalization of our previous result (which uses Littelmann's Lakshmibai-Seshadri paths), in which the level-zero dominant integral weight is assumed to be a posi…
This paper has two main purposes. Firstly we generalise Ram's explicit construction of calibrated representations of the affine Hecke algebra to the multi-parameter case (including the non-reduced $BC_n$ case). We then derive the Plancherel formulae for all rank~1 and rank~2 affine Hecke algebras including a construction of all representations involved (following work of Opdam).
Growth of infinite frieze patterns of affine type
本文研究了通过聚类代数产生的无限条纹图案的增长系数，证明了固定affine类型的聚类类别中，同构和非同构稳定管生成的无限条纹图案具有相同增长系数，并推导了第k个增长系数的显式公式。
Semi-infinite Lakshmibai--Seshadri paths and level-zero extremal weight modules over twisted quantum affine algebras
本文通过引入无限长Lakshmibai-Seshadri路径，建立了扭曲量子齐性代数零级极值权重模块与晶体基之间的同构关系。
On $J$-folded alcove paths and combinatorial representations of affine Hecke algebras
本文引入仿射Weyl群中的$J$-折叠alcove路径组合模型以构造仿射Hecke代数的表示，研究了其有界性，并提出将其组合公式与Kazhdan-Lusztig理论及Opdam的Plancherel定理相联系的猜想。
We use induction from parabolic subalgebras with infinite-dimensional Levi factor to construct new families of irreducible representations for arbitrary Affine Kac-Moody algebra. Our first construction defines a functor from the category of Whittaker modules over the Levi factor of a parabolic subalgebra to the category of modules over the Affine Lie algebra. The second functor sends tensor products of a module over the affine part of the Levi factor (in particular any weight module) and of a Whittaker module over the complement Heisenberg subalgebra to the Affine Lie algebra modules. Both fun…
Let G=GL(N), K=GL(p)xGL(q), where p+q=N, and n be a positive integer. We construct a functor from the category of Harish-Chandra modules for the pair (G,K) to the category of representations of the degenerate affine Hecke algebra of type B_n, and a functor from the category of K-monodromic twisted D-modules on G/K to the category of representations of the degenerate double affine Hecke algebra of type BC_n; the second functor is an extension of the first one. These functors are generalizations of the type A functors from q-alg/9710037 and math/0702670, respectively.
In this paper, we establish a bijection between the infinite reduced words of an affine Weyl group and certain biclosed sets of its positive system and determine all finitely generated biclosed sets in the positive system of an affine Weyl group. Using these results, we show first that the biclosed sets in the standard positive system of rank 3 affine Weyl groups when ordered by inclusion form a complete algebraic ortholattice and secondly that the (generalized) braid graphs of those Coxeter groups are connected, which can be thought of as an infinite version of Tit's solution to the word prob…
The Fermion Model of Representations of Affine Krichever--Novikov Algebras
对于代数曲线上的一般全纯向量丛和半单李代数的不可约有限维表示，我们给出了相应的仿射Krichever-Novikov代数在半无限外形式空间中的表示.它示出，等价的数据对产生等价的表示，反之亦然。
We show that the representation theory for the toroidal extended affine Lie algebras is controlled by a vertex operator algebra which is a tensor product of four VOAs: a sub-VOA of the hyperbolic lattice VOA, two affine VOAs and a Virasoro VOA. A tensor product of irreducible modules for these VOAs admits the structure of an irreducible module for the toroidal extended affine Lie algebra. We also show that for N=12, the sub-VOA of the hyperbolic lattice VOA becomes an exceptional irreducible module for the extended affine Lie algebra of rank 0.
On representation theory of affine Hecke algebras of type B
Ariki和Grojnowski的方法的表示论的仿射Hecke代数的类型$A$适用于类型$B$与不等参数获得-在一定的限制下的特征值的格运营商-类似的多重一个结果和分类的不可约的部分分支规则在类型$A$。
In this paper, we classify the irreducible integrable modules with finite dimensional weight spaces and non-trivial $\widetilde{\mathfrak g}_c$-action for the nullity $2$ toroidal extended affine Lie algebra $\widetilde{\mathfrak g}$, where $\widetilde{\mathfrak g}_c$ is the core of $\widetilde{\mathfrak g}$.
Spectral Characters of Finite-Dimensional Representations of Affine Algebras
我们引入了仿射代数的有限维表示的谱特征的概念。这些可以看作是量子仿射代数的Etingof和Eschericha定义的椭圆特征的一个合适的q=1极限。我们表明，这些字符确定块的范畴有限维模仿射代数。为此，我们使用由Chari和Pressley定义的Weyl模和Weyl模的一些不可分解的可约商。
We initiate the study of affine Deligne-Lusztig varieties with arbitrarily deep level structure for general reductive groups over local fields. We prove that for GLn and its inner forms, Lusztig's semi-infinite Deligne-Lusztig construction is isomorphic to an affine Deligne-Lusztig variety at infinite level. We prove that their homology groups give geometric realizations of the local Langlands and Jacquet--Langlands correspondences in the setting that the Weil parameter is induced from a character of an unramified field extension. In particular, we resolve Lusztig's 1979 conjecture in this set…
On the basic representation of the double affine Hecke algebra at critical level
该研究构造了带约化梯度根系的不可约约化仿射根系对应的临界水平q=1下双仿射Hecke代数的基本表示，补充了非扭型情形下已有研究的覆盖范围。
Affine Hecke algebras and their representations
本文综述了仿射 Hecke 代数的表示理论，重点探讨不可约表示的分类，并在文末提出了实参数仿射 Hecke 代数与仿射 Weyl 群不可约表示间的自然双射这一新结果。
A Construction of Representations of Loop Group and Affine Lie Algebra of $\mathfrak{sl}_n$
该研究构造了$\frak{sl}_n$的圈群表示，推导对应1级仿射Kac-Moody代数表示的公式，并在对偶表示中实现Whittaker泛函，为相关代数表示研究提供新构造。
Inspired by the work [Ra1], we directly give a complete classification of irreducible calibrated representations of affine Yokonuma-Hecke algebras $\widehat{Y}_{r,n}(q)$ over $\mathbb{C},$ which are indexed by $r$-tuples of placed skew shapes. We then develop several applications of this result. In the appendix, inspired by [Ru], we classify and construct irreducible completely splittable representations of degenerate affine Yokonuma-Hecke algebras $D_{r,n}$ and the wreath product $(\mathbb{Z}/r\mathbb{Z})\wr \mathfrak{S}_{n}$ over an algebraically closed field of characteristic $p> 0$ such th…
In this paper, we study the relation between the cocenter $\overline{\tilde \ch_0}$ and the finite dimensional representations of an affine $0$-Hecke algebra $\tilde \ch_0$. As a consequence, we obtain a new criterion on the supersingular modules: a (virtual) module of $\tilde \ch_0$ is supersingular if and only if its character vanishes on the non-supersingular part of $\overline{\tilde \ch_0}$.
We prove that semi-infinite Bruhat order on an affine Weyl group is completely determined from those on the quotients by affine Weyl subgroups associated with various maximal (standard) parabolic subgroups of finite type. Furthermore, for an affine Weyl group of classical type, we give a complete classification of all cover relations of semi-infinite Bruhat order (or equivalently, all edges of the quantum Bruhat graphs) on the quotients in terms of tableaux. Combining these we obtain a tableau criterion for semi-infinite Bruhat order on an affine Weyl group of classical type. As an application…
The goal of this work is to construct a perverse t-structure on the infinity-category of l-adic LG-equivariant sheaves on the loop Lie algebra Lg and to show that the affine Grothendieck-Springer sheaf S is perverse. Moreover, S is an intermediate extension of its restriction to the locus of ``compact" elements with regular semi-simple reduction. Note that classical methods do not apply in our situation because LG and Lg are infinite-dimensional ind-schemes.
Semi-infinite orbits in affine flag varieties and homology of affine Springer fibers
本文研究仿射 Springer 纤维由仿射 Schubert 子簇给出的有限并的同调，证明在足够正则条件下自然包含映射在所有次数上单射，并将其解释为加权轨道积分的范畴化，同时刻画仿射 Schubert 簇为半无限轨道闭包的交。
Parametrizations of infinite biconvex sets in affine root systems
本文详细研究了任意无扭仿射李代数${\mathfrak g}$的正根系$Δ_+$中所有无限“双凸”集的集合${\mathfrak B}^\infty$与${\mathfrak g}$的Weyl群的所有无限"约化字“集${\mathcal W}^\infty$之间的关系.该研究应用于$Δ_+$上的“凸序”分类（参见。\cite{kI}），它们是构造量子化泛包络代数$U_q({\mathfrak g})$的上三角子代数$U_q^+$的Poincaré-Birkhoff-Witt型“凸基”所必需的.我们利用有限维单李代数的数据和双射映射$\nabla\colon\boldsymbol{\mathcal P}\to{\mathfrak B}^\infty$和$χ\colon\boldsymbol{\mathcal P}\to W^\infty$构造了一个集合$\boldsymbol{\mathcal P}$，使得$\nabla=\varPhi^\infty\circχ$，其中$W^\infty$是${\mathcal W}^\infty$的商集，$\varPhi^\infty\colon W^\infty\to{\mathfrak B}^\infty$是自然单射映射.
Using Lakshmibai-Seshadri paths, we give a combinatorial realization of the crystal basis of an extremal weight module of integral extremal weight over the quantized universal enveloping algebra associated to the infinite rank affine Lie algebra of type $B_{\infty}$, $C_{\infty}$, or $D_{\infty}$. Moreover, via this realization, we obtain an explicit description (in terms of Littlewood-Richardson coefficients) of how tensor products of these crystal bases decompose into connected components when their extremal weights are of nonnegative levels. These results, in types $B_{\infty}$, $C_{\infty}…
Prehomogeneous Affine Representations and Flat Pseudo-Riemannian Manifolds
平坦伪黎曼流形和平坦仿射流形的理论与李群的准齐次仿射表示密切相关。在这篇文章中，我们展示了这种对应关系的几个方面。在我们介绍的核心是发展的理论的特征类和字符的预齐次仿射表示。我们给出了有关平坦仿射，以及伪黎曼和辛仿射平坦流形的应用。
On multiplicity-free weight modules over quantum affine algebras
本文旨在构造并研究量子仿射代数的无重数权模，通过引入关于可对称化广义 Cartan 矩阵的可移性条件，探讨了其在代数结构与无穷维模实现中的应用，并计算了相关最高 $\ell$-权。
In this paper we present Affine.m - program for computations in representation theory of finite-dimensional and affine Lie algebras and describe implemented algorithms. Algorithms are based upon the properties of weights and Weyl symmetry. The most important problems for us are the ones, concerning computation of weight multiplicities in irreducible and Verma modules, branching of representations and tensor product decomposition. These problems have numerous applications in physics and we provide some examples of these applications. The program is implemented in popular computer algebra system…
Finite dimensional representations of double affine Hecke algebra of rank 1
在$q$不是1的根的情况下，对$C^{\vee}C_1$型双仿射Hecke代数的有限维表示进行了分类.
We develop the homological theory of KLR algebras of symmetric affine type. For each PBW basis, a family of standard modules is constructed which categorifies the PBW basis.
Affine Krichever-Novikov algebras, their representations and applications
综述了Krichever-Novikov代数理论的现状，包括关于局部中心扩张、不变量、表示和Casimir算子的新结果。
On representations of affine Temperley-Lieb algebras, II
研究了仿射Temperley-Lieb代数及相关胞腔代数的非半单表示。特别是，我们分类简单的标准模块之间的扩展。此外，我们还构造了一个完备化，它是一个无限维的胞腔代数。
Representations of Double Affine Lie algebras
研究了单李代数对应的双仿射李代数的表示。我们构造了一族不可分解的可积表示，并确定了它们的不可约子。我们还给出了不可分解模不可约的一个条件，这类似于量子仿射代数的表示论中的一个结果。最后，在本文的最后一节，我们证明，通过使用融合产品的概念，我们的模块是一般可约。
We construct 2-representations of quantum affine algebras from 2-representations of quantum Heisenberg algebras. The main tool in this construction are categorical vertex operators, which are certain complexes in a Heisenberg 2-representation that recover vertex operators after passing to the Grothendieck group. As an application we categorify the Frenkel-Kac-Segal homogeneous realization of the basic representation of (simply laced) quantum affine algebras. This gives rise to categorical actions of quantum affine (and toroidal) algebras on derived categories of coherent sheaves on Hilbert sch…
Let Uq(g) be the quantum affine superalgebra associated with an affine Kac-Moody superalgebra g which belongs to the three series osp(1|2n)^(1),sl(1|2n)^(2) and osp(2|2n)^(2). We develop vertex operator constructions for the level 1 irreducible integrable highest weight representations and classify the finite dimensional irreducible representations of Uq(g). This makes essential use of the Drinfeld realisation for Uq(g), and quantum correspondences between affine Kac-Moody superalgebras, developed in earlier papers.
In this paper, we will fully describe the representations of the crystallographic rank two affine Hecke algebras using elementary methods, for all possible values of q. The focus is on the case when q is a root of unity of small order.
Evaluation representations of quantum affine algebras at roots of unity
本文的目的是计算量子仿射代数在单位根上的两类赋值表示的Drinfel'd多项式，并构造这两类赋值表示作为Schnizer模的子模.此外，我们还得到了这两类求值表示同构的充要条件。
Some finite dimensional representations of shifted quantum affine algebras of type A
本文研究A型移位量子仿射代数的有限维表示，在分离条件下显式描述张量积，并给出若干有限维单模的q-特征。
We construct a new family of irreducible modules over any basic classical affine Kac-Moody Lie superalgebra which are induced from modules over the Heisenberg subalgebra. We also obtain irreducible deformations of these modules for the quantum affine superalgebra of type A.
Unitary representations of the extended affine Lie algebra $\widetilde{\frak{gl}_{3}(\bc_q)}$
利用自由域的思想给出了广义仿射李代数$\widetilde{\frak{gl}_{3}(\bc_q)}$的模.给出了模是酉模的一个充要条件。
GKLO representations for shifted quantum affine symmetric pairs
本文提出了一种移位量子 affine 对称对的GKLO表示构造方法，并证明了其有效性。
This paper studies affine Deligne-Lusztig varieties in the affine flag manifold of GL_2. At first we determine all such varieties up to isomorphy. After this we investigate the representations of the sigma-stabilizer of an element b of the group on the etale cohomology of the affine Deligne-Lusztig variety X_w(b). We describe such representations as inductions from compact subgroups and in terms of noncuspidal representations.
We study the classical limit of a family of irreducible representations of the quantum affine algebra associated to $\mathfrak{sl}_{n+1}$. After a suitable twist, the limit is a module for $\mathfrak{sl}_{n+1}[t]$, i.e., for the maximal standard parabolic subalgebra of the affine Lie algebra. Our first result is about the family of prime representations introduced in the context of a monoidal categorification of cluster algebras. We show that these representations specialize (after twisting), to $\mathfrak{sl}_{n+1}[t]$--stable, prime Demazure modules in level two integrable highest weight rep…
Reducibility of induced discrete series representations for affine Hecke algebras of type B
最近Delorme和Opdam将R-群的理论推广到了具有不等标号的仿射Hecke代数。我们应用他们的结果的情况下，仿射Hecke代数是B型，诱导离散级数表示与真正的中心字符。我们计算了这样一个诱导表示的R-群，并证明了它将多重自由分解为2^d不可约和项。功率d可以组合地计算。
We study the connection between the category of modules over the affine Kac-Moody Lie algebra at the critical level, and the category of D-modules on the affine flag scheme G((t))/I, where I is the Iwahori subgroup. We prove a localization-type result, which establishes an equivalence between certain subcategories on both sides. We also establish an equivalence between a certain subcategory of Kac-Moody modules, and the category of quasi-coherent sheaves on the scheme of Miura opers for the Langlands dual group, thereby proving a conjecture of [FG2].
t-analogue of the q-characters of finite dimensional representations of quantum affine algebras
Frenkel-Reshetikhin引入了量子仿射代数有限维表示的$q$ -特征标。我们给出了一个组合算法来计算它们的所有简单的模块。我们的工具是$t$ -类似的$q$ -字符，这是类似于Kazhdan-Lusztig多项式，我们的算法有相似的定义。
We conjecture an explicit bound on the prime characteristic of a field, under which the Weyl modules of affine $\mathfrak{sl}_2$ and the minimal series modules of Virasoro algebra remain irreducible, and Goddard-Kent-Olive coset construction for affine $\mathfrak{sl}_2$ is valid.
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