Irreducible representations for toroidal Lie-algebras
Irreducible representations for toroidal Lie-algebras
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DOI:
10.1016/j.jpaa.2005.01.011
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发表时间:
2002-12
影响因子:
0.8
通讯作者:
S. E. Rao
中科院分区:
文献类型:
--
作者:
S. E. Rao
Let G be a simple finite-dimensional Lie-algebra over the complex numbers C. The universal central extension of G⊗C[t1±1,…,tn±1] is denoted by τ0. We add degree derivations d1,…,dnto τ0and denote the resulting Lie-algebra by τ which we call a toroidal Lie-algebra. For n⩾2 it is known that the center of τ0is infinite dimensional. This infinite center, which is only an abelian ideal in τ, does not act as scalars on any irreducible representation of τ. In this paper, we prove that the study of irreducible representation of τ with finite-dimensional weight spaces is reduced to the study of irreducible representation for τ0⊕Cdnwith finite-dimensional weight spaces on which the center acts as scalars. In the process we prove an interesting result for n⩾2. Let τ¯ be the quotient of τ by the non-zero degree central operators. Then τ¯ does not admit representations with finite dimensional weight spaces where the zero degree center acts non-trivially.