Goran Trupčević
We use combinatorial description of bases of Feigin-Stoyanovsky's type subspaces of standard modules of level 1 for affine Lie algebras of types $A_\ell^{(1)}$ and $D_4^{(1)}$ to obtain character formulas. These descriptions naturally lead to systems of recurrence relations for which we also find solutions.
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We construct particle basis for Feigin-Stoyanovsky's type subspaces of level $1$ standard $\tilde{\mathfrak{sl}}_{\ell+1}(\mathbb{C})$-modules. From the description we obtain character formulas.
Character formulas for Feigin-Stoyanovsky's type subspaces of standard $\mathfrak{sl}(3, \mathbb{C})^{\widetilde{}}$-modules
本文通过求解递推关系系统，获得标准sl(3,C)~模中李-斯托扬诺夫斯基型子空间的特征公式。
In this paper we construct combinatorial bases of Feigin-Stoyanovsky's type subspaces of standard modules for level $k$ affine Lie algebra $C_\ell^{(1)}$. We prove spanning by using annihilating field $x_θ(z)^{k+1}$ of standard modules. In the proof of linear independence we use simple currents and intertwinining operators whose existence is given by fusion rules.
We give an alternative proof of the main result of the paper http://arxiv.org/abs/math/0112104, the proof relies on Brion's theorem about convex polyhedra. The result itself can be viewed as a formula for the character of the Feigin-Stoyanovsky subspace of an integrable irreducible representation of the affine Lie algebra $\widehat{\mathfrak{sl}_n}(\mathbb{C})$. Our approach is to assign integer points of a certain polytope to the vectors comprising a monomial basis of the subspace and then compute the character via (a variation of) Brion's theorem.
Let $\gtl$ be an affine Lie algebra of type $D_{\ell}^{(1)}$ and $L(Λ)$ its standard module with a highest weight vector $v_Λ$. For a given $\Z$-gradation $\gtl = \gtl_{-1} + \gtl_0 + \gtl_1$, we define Feigin-Stoyanovsky's type subspace as $$W(Λ) = U(\gtl_1) \cdot v_Λ.$$ By using vertex operator relations for standard modules we reduce the Ponicaré-Brikhoff-Witt spanning set of $W(Λ)$ to a basis and prove its linear independence by using Dong-Lepowsky intertwining operators.
Feigin-Stoyanovsky's type subspace $W(Λ)$ of a standard $\tilde{\mathfrak g}$-module $L(Λ)$ is a $\tilde{\mathfrak g}_1$-submodule of $L(Λ)$ generated by the highest-weight vector $v_Λ$, where $\tilde{\mathfrak g}_1$ is a certain commutative subalgebra of $\tilde{\mathfrak g}$. Based on the description of basis of $W(Λ)$ for $\tilde{\mathfrak g}$ of type $C_\ell^{(1)}$, we give a presentation of this subspace in terms of generators and relations $$W(Λ)\simeq U(\tilde{\mathfrak g}_1^-)/J.$$
Let $\tilde{\mathfrak g}$ be an affine Lie algebra of the type $A_\ell^{(1)}$. We find a combinatorial basis of Feigin-Stoyanovsky's type subspace $W(Λ)$ given in terms of difference and initial conditions. Linear independence of the generating set is proved inductively by using coefficients of intertwining operators. A basis of $L(Λ)$ is obtained as an "inductive limit" of the basis of $W(Λ)$.
Let $\tilde{\mathfrak g}$ be an affine Lie algebra of type $A_\ell^{(1)}$. Suppose we're given a $\mathbb Z$-gradation of the corresponding simple finite-dimensional Lie algebra ${\mathfrak g}={\mathfrak g}_{-1}\oplus{\mathfrak g}_0 \oplus {\mathfrak g}_1$; then we also have the induced $\mathbb Z$-gradation of the affine Lie algebra $$\tilde{\mathfrak g}=\tilde{\mathfrak g}_{-1} \oplus \tilde{\mathfrak g}_0 \oplus \tilde{\mathfrak g}_1.$$ Let $L(Λ)$ be a standard module of level 1. Feigin-Stoyanovsky's type subspace $W(Λ)$ is the $\tilde{\mathfrak g}_1$-submodule of $L(Λ)$ generated by the hi…
Jet Schemes, Quantum Dilogarithm and Feigin-Stoyanovsky's Principal Subspaces
本文从jet代数视角分析了仿射李代数的Feigin-Stoyanovsky主子空间，利用量子双对数和quiver表示推导出新特征标公式，并证明了A型1级主子空间的经典自由性。
Feigin-Stoyanovsky's type subspaces for affine Lie algebras of type $C_\ell^{(1)}$ have monomial bases with a nice combinatorial description. We describe bases of whole standard modules in terms of semi-infinite monomials obtained as "a limit of translations" of bases for Feigin-Stoyanovsky's type subspaces.
By using the known description of combinatorial bases for Feigin-Stoyanovsky's type subspaces of standard modules for affine Lie algebra $\mathfrak{sl}(l+1,\mathbb{C})^{\widetilde{}}$, as well as certain intertwining operators between standard modules, we obtain exact sequences of Feigin-Stoyanovsky's type subspaces at fixed level $k$. This directly leads to systems of recurrence relations for formal characters of those subspaces.
We study several families of vertex operator superalgebras from a jet (super)scheme point of view. We provide new examples of vertex algebras which are "chiralizations" of their Zhu's Poisson algebras $R_V$. Our examples come from affine $C_\ell^{(1)}$-series vertex algebras ($\ell \geq 1$), certain $N=1$ superconformal vertex algebras, Feigin-Stoyanovsky principal subspaces, Feigin-Stoyanovsky type subspaces, graph vertex algebras $W_Γ$, and extended Virasoro vertex algebra. We also give a counterexample to the chiralization property for the $N=2$ superconformal vertex algebra of central char…
We construct new monomial quasi-particle bases of Feigin-Stoyanovsky's type subspaces for affine Lie algebra $\mathfrak{sl}(3,\mathbb{C})^{\widetilde{}}$ from which the known fermionic-type formulas for $(k,3)$-admissible configurations follow naturally. In the proof we use vertex operator algebra relations for standard modules and coefficients of intertwining operators.
We use vertex operator algebras and intertwining operators to study certain substructures of standard $A_1^{(1)}$--modules, allowing us to conceptually obtain the classical Rogers--Ramanujan recursion. As a consequence we recover Feigin-Stoyanovsky's character formulas for the principal subspaces of the level 1 standard $A_1^{(1)}$--modules.
Certain combinatorial bases of Feigin-Stoyanovsky's type subspaces of level k standard modules for affine Lie algebra sl(r,C)\sptilde are parametrized by (k,r)-admissible configurations. In this note we use Capparelli-Lepowsky-Milas' method to give a new proof of linear independence of these bases, the main ingredient in the proof being the use of Dong-Lepowsky's intertwining operators for fundamental sl(r,C)\sptilde-modules.
We give a new presentation of the Drinfeld double of the elliptic Hall algebra introduced in a previous work with I. Burban. This presentation is similar in spirit to Drinfeld's `new realization' of quantum affine algebras. This answers, in the case of elliptic curves, a question of Kapranov concerning functional relations satisfied by (principal, unramified) Eisenstein series for the groups GL(n) over a function field. It also provides proofs of some recent conjectures of Feigin, Feigin, Jimbo, Miwa and Mukhin.
By using the ideas of Feigin and Stoyanovsky and Calinescu, Lepowsky and Milas we introduce and study the principal subspaces associated with the Etingof-Kazhdan quantum affine vertex algebra of integer level $k\geqslant 1$ and type $A_1^{(1)}$. We show that the principal subspaces possess the quantum vertex algebra structure, which turns to the usual vertex algebra structure of the principal subspaces of generalized Verma and standard modules at the classical limit. Moreover, we find their topological quasi-particle bases which correspond to the sum sides of certain Rogers-Ramanujan-type iden…
A Conjecture of Warnaar-Zudilin from Deformations of Lie Superalgebras
通过李超代数形变方法，证明了Warnaar-Zudilin猜想中的$q$-级数恒等式，并填补了Stoyanovsky关于主子空间特征与仿射顶点代数特征等同的空白。
In the paper [J. Math. Phys. 50 (2009), 095215, 42 pages, arXiv:0904.2291], Feigin, Hashizume, Hoshino, Shiraishi, and Yanagida constructed two families of commuting operators which contain the Macdonald operator (commutative families of the Macdonald operator). They used the Ding-Iohara-Miki algebra and the trigonometric Feigin-Odesskii algebra. In the previous paper [arXiv:1301.4912], the present author constructed the elliptic Ding-Iohara-Miki algebra and the free field realization of the elliptic Macdonald operator. In this paper, we show that by using the elliptic Ding-Iohara-Miki algebra…
We study the elliptic algebras $Q_{n,k}(E,τ)$ introduced by Feigin and Odesskii as a generalization of Sklyanin algebras. They form a family of quadratic algebras parametrized by coprime integers $n>k\geq 1$, an elliptic curve $E$, and a point $τ\in E$. We consider and compare several different definitions of the algebras and provide proofs of various statements about them made by Feigin and Odesskii. For example, we show that $Q_{n,k}(E,0)$, and $Q_{n,n-1}(E,τ)$ are polynomial rings on $n$ variables. We also show that $Q_{n,k}(E,τ+ζ)$ is a twist of $Q_{n,k}(E,τ)$ when $ζ$ is an $n$-torsion po…
In this paper we construct bases of standard (i.e. integrable highest weight) modules $L(Λ)$ for affine Lie algebra of type $B_2\sp{(1)}$ consisting of semi-infinite monomials. The main technical ingredient is a construction of monomial bases for Feigin-Stoyanovsky type subspaces $W(Λ)$ of $L(Λ)$ by using simple currents and intertwining operators in vertex operator algebra theory. By coincidence $W(kΛ_0)$ for $B_2\sp{(1)}$ and the integrable highest weight module $L(kΛ_0)$ for $A_1\sp{(1)}$ have the same parametrization of combinatorial bases and the same presentation $\mathcal P/\mathcal I$\…
Linear independence for $C_\ell^{(1)}$ by using $C_{2\ell}^{(1)}$
本研究通过建立标准$C_\ell^{(1)}$-模$L(k\Lambda_0)$的组合生成集与$C_{2\ell}^{(1)}$-模的Feigin-Stoyanovsky型子空间组合基的联系，证明该生成集的线性无关性，子空间基的无关性借助顶点算子代数的简单流与缠结算子证得。
This is the first in a series of papers in which we study vertex-algebraic structure of Feigin-Stoyanovsky's principal subspaces associated to standard modules for both untwisted and twisted affine Lie algebras. A key idea is to prove suitable presentations of principal subspaces, without using bases or even ``small'' spanning sets of these spaces. In this paper we prove presentations of the principal subspaces of the basic A_1^(1)-modules. These convenient presentations were previously used in work of Capparelli-Lepowsky-Milas for the purpose of obtaining the classical Rogers-Ramanujan recurs…
We consider two different methods of associating vertex algebraic structures with the level $1$ principal subspaces for $U_q (\widehat{\mathfrak{sl}}_2)$. In the first approach, we introduce certain commutative operators and study the corresponding vertex algebra and its module. We find combinatorial bases for these objects and show that they coincide with the principal subspace bases found by B. L. Feigin and A. V. Stoyanovsky. In the second approach, we introduce the, so-called nonlocal $\underline{\mathsf{q}}$-vertex algebras, investigate their properties and construct the nonlocal $\underl…
The algebras $Q_{n,k}(E,τ)$ introduced by Feigin and Odesskii as generalizations of the 4-dimensional Sklyanin algebras form a family of quadratic algebras parametrized by coprime integers $n>k\ge 1$, a complex elliptic curve $E$, and a point $τ\in E$. The main result in this paper is that $Q_{n,k}(E,τ)$ has the same Hilbert series as the polynomial ring on $n$ variables when $τ$ is not a torsion point. We also show that $Q_{n,k}(E,τ)$ is a Koszul algebra, hence of global dimension $n$ when $τ$ is not a torsion point, and, for all but countably many $τ$, it is Artin-Schelter regular. The proof…
Semi-infinite construction for the double Yangian of type $A_1^{(1)}$
本文研究基于Iohara-Kohno实现的double Yangian DY(gl_2)的level 1无穷维模，证明其具有由满足差二条件的稳定可积算子半无穷单项式表示的Feigin-Stoyanovsky型拓扑基，并给出该基在相应量子仿射顶点代数表示理论中的应用。
The paper is devoted to the proof of the following conjecture due to B. Feigin. Let $\frak u_\ell$ be the small quantum group a the primitive $\ell$-th root of unity. Then it is known that the usual $Ext$ algebra of the trivial $\frak u_\ell$-module is isomorphic to the algebra of regular functions on the nilpotent variety $\cal N$ in the corresponding simple Lie algebra $\frak g$ (see [GK]). Consider semiinfinite cohomology of the trivial $\frak u_\ell$-module introduced in [Ar1], [Ar2]. It was shown in [Ar2] that the $Ext$ algebra of the trivial $\frak u_\ell$-module acts naturally on semiin…
Character recurrences and level one formulas for $B_2^{(1)}$
本文为 $B_2^{(1)}$ 标准模的 Feigin-Stoyanovsky 子空间建立特征递推，给出显式多项式系数，证明唯一性，并在水平 1 求解得到费米子公式，且与 $A_1^{(1)}$ 模的生成函数关联。
Linear Independence for $A_1^{(1)}$ by Using $C_{2}^{(1)}$
本文将此前基于 Feigin-Stoyanovsky 型子空间组合基证明标准 $C_\ell^{(1)}$-模生成集线性无关性的方法推广到所有标准 $A_1^{(1)}$-模，并借助 $C_2^{(1)}$-模交织算子系数完成证明。
The elliptic algebras in the title are connected graded $\mathbb{C}$-algebras, denoted $Q_{n,k}(E,τ)$, depending on a pair of relatively prime integers $n>k\ge 1$, an elliptic curve $E$, and a point $τ\in E$. This paper examines a canonical homomorphism from $Q_{n,k}(E,τ)$ to the twisted homogeneous coordinate ring $B(X_{n/k},σ',\mathcal{L}'_{n/k})$ on the characteristic variety $X_{n/k}$ for $Q_{n,k}(E,τ)$. When $X_{n/k}$ is isomorphic to $E^g$ or the symmetric power $S^gE$ we show the homomorphism $Q_{n,k}(E,τ) \to B(X_{n/k},σ',\mathcal{L}'_{n/k})$ is surjective, that the relations for $B(X_…
Orthosymplectic Feigin-Semikhatov duality
本文研究了正交辛类型的Feigin-Semikhatov对称性，通过相对半无限上同调和能级流动扭，建立了W超代数权重模的块等价性，并推导了特征公式。
This paper examines an algebraic variety that controls an important part of the structure and representation theory of the algebra $Q_{n,k}(E,τ)$ introduced by Feigin and Odesskii. The $Q_{n,k}(E,τ)$'s are a family of quadratic algebras depending on a pair of coprime integers $n>k\ge 1$, an elliptic curve $E$, and a point $τ\in E$. It is already known that the structure and representation theory of $Q_{n,1}(E,τ)$ is controlled by the geometry associated to $E$ embedded as a degree $n$ normal curve in the projective space $\mathbb P^{n-1}$, and by the way in which the translation automorphism $…
This is the first of a series of papers studying combinatorial (with no ``subtractions'') bases and characters of standard modules for affine Lie algebras, as well as various subspaces and ``coset spaces'' of these modules. In part I we consider certain standard modules for the affine Lie algebra $\ga,\;\g := sl(n+1,\C),\;n\geq 1,$ at any positive integral level $k$ and construct bases for their principal subspaces (introduced and studied recently by Feigin and Stoyanovsky [FS]). The bases are given in terms of partitions: a color $i,\;1\leq i \leq n,$ and a charge $s,\; 1\leq s \leq k,$ are a…
Feigin-Semikhatov duality at the critical level
研究临界水平下Feigin-Semikhatov对偶性，通过构造函子实现顶点代数范畴的块状等价，揭示次正则W-代数与主W-超代数的结构关系。
Fix a pair of relatively prime integers $n>k\ge 1$, and a point $(η\,|\,τ)\in\mathbb{C}\times\mathbb{H}$, where $\mathbb{H}$ denotes the upper-half complex plane, and let ${{a\;\,b}\choose{c\,\;d}}\in\mathrm{SL}(2,\mathbb{Z})$. We show that Feigin and Odesskii's elliptic algebras $Q_{n,k}(η\,|\,τ)$ have the property $Q_{n,k}\big(\fracη{cτ+d}\,\big\vert\,\frac{aτ+b}{cτ+d}\big)\cong Q_{n,k}(η\,|\,τ)$. As a consequence, given a pair $(E,ξ)$ consisting of a complex elliptic curve $E$ and a point $ξ\in E$, one may unambiguously define $Q_{n,k}(E,ξ):=Q_{n,k}(η\,|\,τ)$ where $τ\in\mathbb{H}$ is any p…
Generating sets of standard modules for $D_4^{(1)}$
本文提出一种方法，通过顶点算子关系构造 $D_4^{(1)}$ 标准模的生成集，并将其与极限过程联系起来。
Quantum loop groups and shuffle algebras via Lyndon words
本文通过环路词组合学推广有限型方法，研究量子环路群的PBW基，并证明Enriquez同态到椭圆代数三角退化为同构。
We prove Feigin-Frenkel type dualities between subregular W-algebras of type A, B and principal W-superalgebras of type $\mathfrak{sl}(1|n), \mathfrak{osp}(2|2n)$. The type A case proves a conjecture of Feigin and Semikhatov. Let $(\mathfrak{g}_1,\mathfrak{g}_2) = (\mathfrak{sl}_{n+1},\mathfrak{sl}(1|n+1))$ or $(\mathfrak{so}_{2n+1}, \mathfrak{osp}(2|2n))$ and let $r$ be the lacity of $\mathfrak{g}_1$. Let k be a complex number and $\ell$ defined by $r(k+h^\vee_1)(\ell+h^\vee_2)=1$ with $h^\vee_i$ the dual Coxeter numbers of the $\mathfrak g_i$. Our first main result is that the Heisenberg cos…
The Kazhdan-Lusztig category of $\mathfrak{osp}_{1|2n}$ at irrational levels
本文证明了 $\mathfrak{osp}_{1|2n}$ 在无理水平下的 Kazhdan-Lusztig 对应，建立了其仿射顶点算子超代数范畴与量子群范畴及 $\mathfrak{so}_{2n+1}$ 对应范畴的辫子张量等价，并构造了新的简单共形顶点（超）代数族。
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