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Many $W$-algebras (e.g. the $W_N$ algebras) are consistent for all values of the central charge except for a discrete set of exceptional values. We show that such algebras can be contracted to new consistent degenerate algebras at these…

High Energy Physics - Theory · Physics 2015-06-26 C. M. Hull , L. Palacios

All simple weight modules with finite dimensional weight spaces over affine Lie algebras are classified.

Representation Theory · Mathematics 2009-10-06 Ivan Dimitrov , Dimitar Grantcharov

In this paper, we prove that uniformly bounded simple Lie conformal algebra must be finitely generated. Furthermore, we give a completely classification of simple uniformly bounded Lie conformal algebras with upper bound one.

Rings and Algebras · Mathematics 2025-03-11 Maosen Xu , Huangjie Yu , Lipeng Luo

A unified description of the relationship between the Hamiltonian structure of a large class of integrable hierarchies of equations and W-algebras is discussed. The main result is an explicit formula showing that the former can be…

High Energy Physics - Theory · Physics 2007-05-23 C. R. Fernández-Pousa , M. V. Gallas , J. L. Miramontes , J. Sánchez Guillén

In this paper we determine all types and the canonical forms of simple subalgebras for each type of simple Jordan algebras and the number of conjugate classes corresponding to the given simple Jordan algebra.

Rings and Algebras · Mathematics 2007-05-23 M. V. Tvalavadze

In this paper, the complete algebraic structure of finite semisimple group algebra of a normally monomial group is described. The main result is illustrated by computing the explicit Wedderburn decomposition of finite semisimple group…

Rings and Algebras · Mathematics 2017-07-27 Shalini Gupta , Sugandha Maheshwary

Over an algebraically closed field we classify all minimal representation-infinite algebras where the lattice of two-sided ideals is not distributive. As a consequence there are only finitely many isomorphism classes of minimal…

Representation Theory · Mathematics 2023-05-22 Klaus Bongartz

We introduce a new class of simple Lie algebras $W(n,m)$ that generalize the Witt algebra by using "exponential" functions, and also a subalgebra $W^*(n,m)$ thereof; and we show each derivation of $W^*(1,0)$ can be written as a sum of an…

Representation Theory · Mathematics 2016-09-07 Ki-Bong Nam

We give an explicit classification of the cominuscule parabolic subalgebras of all complex simple finite dimensional Lie superalgebras.

Rings and Algebras · Mathematics 2012-01-04 Dimitar Grantcharov , Milen Yakimov

In this paper, we classify simple Harish-Chandra modules over simple generalized Witt algebras.

Representation Theory · Mathematics 2023-08-08 Rencai Lu , Yaohui Xue

We illustrate some simple ideas that can be used for obtaining a classification of small-dimensional solvable Lie algebras.Using these we obtain the classification of 3 and 4 dimensional solvable Lie algebras (over fields of any…

Rings and Algebras · Mathematics 2007-05-23 W. A. de Graaf

We explicitly provide minimal Gr\"obner bases for simple, finite-dimensional modules of complex Lie algebras of types A and C, using a homogeneous ordering that is compatible with the PBW filtration on the universal enveloping algebras.

Representation Theory · Mathematics 2024-01-12 Ghislain Fourier , León van Eß

Recently, a new generalized family of infinite-dimensional $ \widetilde{W} $ algebras, each associated with a particular element of a commutative subalgebra of the $ W_{1+\infty} $ algebra, was described. This paper provides a comprehensive…

High Energy Physics - Theory · Physics 2024-10-22 Yaroslav Drachov

We provide a complete classification of unitary subalgebras of even rank-one lattice vertex operator algebras. As a consequence of the correspondence between vertex operator algebras and conformal nets, we also obtain a complete…

Operator Algebras · Mathematics 2019-09-23 Sebastiano Carpi , Tiziano Gaudio , Robin Hillier

In this paper we present a complete classification (isomorphism classes with some isomorphism invariants) of complex associative algebras up to dimension five (including both cases: unitary and non-unitary). In some symbolic computations we…

Rings and Algebras · Mathematics 2009-10-07 I. S. Rakhimov , I. M. Rikhsiboev , W. Basri

We give a conceptual explanation of universal deformation formulas for unital associative algebras and prove some results on the structure of their moduli spaces. We then generalize universal deformation formulas to other types of algebras…

Algebraic Topology · Mathematics 2013-08-19 Elisabeth Remm , Martin Markl

We present a classification of $W$ algebras and superalgebras arising in Abelian as well as non Abelian Toda theories. Each model, obtained from a constrained WZW action, is related with an $Sl(2)$ subalgebra (resp. $OSp(1|2)$ superalgebra)…

High Energy Physics - Theory · Physics 2009-10-22 L. Frappat , E. Ragoucy , P. Sorba

A classification theorem is obtained for a class of unital simple separable amenable Z-stable C*-algebras which exhausts all possible values of the Elliott invariant for unital stably finite simple separable amenable Z-stable C*-algebras.…

Operator Algebras · Mathematics 2021-05-05 Guihua Gong , Huaxin Lin , Z. Niu

Two series of W-algebras with two generators are constructed from chiral vertex operators of a free field representation. If $c = 1 - 24k$, there exists a W(2,3k) algebra for k in $Z_{+}/2$ and a W(2,8k) algebra for k in $Z_{+}/4$. All…

High Energy Physics - Theory · Physics 2009-10-22 Michael Flohr

We prove the long-standing conjecture on the coset construction of the minimal series principal $W$-algebras of $ADE$ types in full generality. We do this by first establishing Feigin's conjecture on the coset realization of the universal…

Quantum Algebra · Mathematics 2020-05-13 Tomoyuki Arakawa , Thomas Creutzig , Andrew R. Linshaw