n-Point Virasoro algebras and their modules of densities
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Bibliographic record
Abstract
In this paper we introduce and study n-point Virasoro algebras, [Formula: see text], which are natural generalizations of the classical Virasoro algebra and have as quotients multipoint genus zero Krichever–Novikov type algebras. We determine necessary and sufficient conditions for the latter two such Lie algebras to be isomorphic. Moreover we determine their automorphisms, their derivation algebras, their universal central extensions, and some other properties. The list of automorphism groups that occur is C n , D n , A 4 , S 4 and A 5 . We also construct a large class of modules which we call modules of densities, and determine necessary and sufficient conditions for them to be irreducible.
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