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arXiv · 1608.00412

A Universal Construction of Universal Deformation Formulas, Drinfel'd Twists and their Positivity

Chiara Esposito·Jonas Schnitzer·Stefan Waldmann
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Abstract

In this paper we provide an explicit construction of star products on U(g)-module algebras by using the Fedosov approach. This construction allows us to give a constructive proof to Drinfel'd theorem and to obtain a concrete formula for Drinfel'd twist. We prove that the equivalence classes of twists are in one-to-one correspondence with the second Chevalley-Eilenberg cohomology of the Lie algebra g. Finally, we show that for Lie algebras with K\"ahler structure we obtain a strongly positive universal deformation of *-algebras by using a Wick-type deformation. This results in a positive Drinfel'd twist.

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Chiara Esposito, Jonas Schnitzer, Stefan Waldmann. 2016-08-01. A Universal Construction of Universal Deformation Formulas, Drinfel'd Twists and their Positivity. https://doi.org/10.2140/pjm.2017.291.319

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