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Chiara Esposito
Title: Obstructions of Drinfel'd twist deformations
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Abstract: Given a Drinfel'd twist on the universal enveloping algebra of a Lie
algebra g one can write the correponding realization in terms of left-
invariant bidi
erential operators on the Lie group G and obtain a left-
invariant star product on G. This procedure can be extended to any
U(g)-module algebra A. The question we answer in this talk is in which
conditions this is not possible. In other words, we study when a star prod-
uct can not be induced by a twist. This is a joint work with P. Bieliavsky,
S. Waldmann and T. Weber.
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