Classification of Graded Left-symmetric Algebra Structures on Witt and Virasoro Algebras

Details Classification of Graded Left-symmetric Algebra Structures on Witt and Virasoro Algebras Classification of Graded Left-symmetric Algebra Structures on Witt and Virasoro Algebras

2007-06-28

arxiv.org/abs/0706.4229v2

Mathematics

Quantum Algebra

22 pages

Scientific paper

We find that a compatible graded left-symmetric algebra structure on the Witt algebra induces an indecomposable module of the Witt algebra with 1-dimensional weight spaces by its left multiplication operators. From the classification of such modules of the Witt algebra, the compatible graded left-symmetric algebra structures on the Witt algebra are classified. All of them are simple and they include the examples given by Chapoton and Kupershmidt. Furthermore, we classify the central extensions of these graded left-symmetric algebras which give the compatible graded left-symmetric algebra structures on the Virasoro algebra. They coincide with the examples given by Kupershmidt.

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