Graded contractions of Virasoro algebras

@inproceedings{Kostyakov2001GradedCO,
  title={Graded contractions of Virasoro algebras},
  author={I. V. Kostyakov and Nikolay A. Gromov and Vasiliy Kuratov},
  year={2001}
}
We describe graded contractions of Virasoro algebra. The highest weight representations of Virasoro algebra are constructed. The reducibility of representations is analysed. In contrast to standart representations the contracted ones are reducible except some special cases. Moreover we find an exotic module with null-plane on fifth level. 

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