Indecomposable modules of the immediate series over W(a,b) algebras

Details Indecomposable modules of the immediate series over W(a,b) algebras Indecomposable modules of the immediate series over W(a,b) algebras

2011-03-20

arxiv.org/abs/1103.3850v1

Mathematics

Representation Theory

24 pages

Scientific paper

For any complex parameters a,b, the W(a,b) algebra is the Lie algebra with basis {L_i,W_i|i\in Z}, and relations [L_i,L_j]=(j-i)L_{i+j}, [L_i,W_j]=(a+j+bi)W_{i+j},[W_i,W_j]=0. In this paper, indecomposable modules of the intermediate series over W(a,b) are classified. It is also proved that an irreducible Harish-Chandra W(a,b)-module is either a highest/lowest weight module or a uniformly bounded module. Furthermore, if a\notin Q, an irreducible weight W(a,b)-module is simply a Vir-module with trivial actions of W_k.

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