scholarly journals Highest weight representations of a Lie algebra of Block type

2007 ◽  
Vol 50 (4) ◽  
pp. 549-560 ◽  
Author(s):  
Yue-zhu Wu ◽  
Yu-cai Su
Keyword(s):  
Lie Algebra ◽  
Block Type ◽  
Highest Weight ◽  
Highest Weight Representations

scholarly journals Isomorphisms of Twisted Hilbert Loop Algebras

2017 ◽  
Vol 69 (02) ◽  
pp. 453-480
Author(s):  
Timothée Marquis ◽  
Karl-Hermann Neeb
Keyword(s):  
Root System ◽  
Lie Algebra ◽  
Lie Algebras ◽  
Positive Energy ◽  
Algebra Structure ◽  
Affine Lie Algebras ◽  
Subsequent Work ◽  
Highest Weight ◽  
Loop Algebras ◽  
Highest Weight Representations

Abstract The closest infinite-dimensional relatives of compact Lie algebras are Hilbert-Lie algebras, i.e., real Hilbert spaces with a Lie algebra structure for which the scalar product is invariant. Locally affine Lie algebras (LALAs) correspond to double extensions of (twisted) loop algebras over simple Hilbert-Lie algebras , also called affinisations of . They possess a root space decomposition whose corresponding root system is a locally affine root system of one of the 7 families for some infinite set J. To each of these types corresponds a “minimal ” affinisation of some simple Hilbert-Lie algebra , which we call standard. In this paper, we give for each affinisation g of a simple Hilbert-Lie algebra an explicit isomorphism from g to one of the standard affinisations of . The existence of such an isomorphism could also be derived from the classiffication of locally affine root systems, but for representation theoretic purposes it is crucial to obtain it explicitly as a deformation between two twists that is compatible with the root decompositions. We illustrate this by applying our isomorphism theorem to the study of positive energy highest weight representations of g. In subsequent work, this paper will be used to obtain a complete classification of the positive energy highest weight representations of affinisations of .

scholarly journals Verma Modules over a Block Lie Algebra

2008 ◽  
Vol 15 (02) ◽  
pp. 235-240 ◽  
Author(s):  
Qifen Jiang ◽  
Yuezhu Wu
Keyword(s):  
Lie Algebra ◽  
Verma Module ◽  
Total Order ◽  
Block Type ◽  
Verma Modules ◽  
Additive Subgroup ◽  
Highest Weight ◽  
Proper Quotient

Let [Formula: see text] be the Lie algebra with basis {Li,j, C|i, j ∈ ℤ} and relations [Li,j, Lk,l] = ((j + 1)k - i(l + 1))Li+k, j+l + iδi, -kδj+l, -2C and [C, Li,j] = 0. It is proved that an irreducible highest weight [Formula: see text]-module is quasifinite if and only if it is a proper quotient of a Verma module. An additive subgroup Γ of 𝔽 corresponds to a Lie algebra [Formula: see text] of Block type. Given a total order ≻ on Γ and a weight Λ, a Verma [Formula: see text]-module M(Λ, ≻) is defined. The irreducibility of M(Λ, ≻) is completely determined.

scholarly journals DEMAZURE MODULES OF LEVEL TWO AND PRIME REPRESENTATIONS OF QUANTUM AFFINE 

2015 ◽  
Vol 17 (1) ◽  
pp. 75-105 ◽  
Author(s):  
Matheus Brito ◽  
Vyjayanthi Chari ◽  
Adriano Moura
Keyword(s):  
Lie Algebra ◽  
Cluster Algebras ◽  
Fusion Product ◽  
Parabolic Subalgebra ◽  
Highest Weight ◽  
Affine Lie Algebra ◽  
The Family ◽  
Demazure Module ◽  
Highest Weight Representations ◽  
Demazure Modules

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 Hernandez and Leclerc (Duke Math. J.154 (2010), 265–341; Symmetries, Integrable Systems and Representations, Springer Proceedings in Mathematics & Statitics, Volume 40, pp. 175–193 (2013)), 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 representations of the classical affine Lie algebra. It was proved in Chari et al. (arXiv:1408.4090) that a stable Demazure module is isomorphic to the fusion product of stable prime Demazure modules. Our next result proves that such a fusion product is the limit of the tensor product of the corresponding irreducible prime representations of quantum affine $\mathfrak{sl}_{n+1}$.

scholarly journals Irreducible highest weight representations of the simple n-Lie algebra

2012 ◽  
Vol 17 (3) ◽  
pp. 593-613 ◽  
Author(s):  
Dana Bălibanu ◽  
Johan van de Leur
Keyword(s):  
Lie Algebra ◽  
Highest Weight ◽  
Highest Weight Representations
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