Compressed Drinfeld associators

Abstract : Drinfeld associator is a key tool in computing the Kontsevich integral of knots. A Drinfeld associator is a series in two non-commuting variables, satisfying highly complicated algebraic equations - hexagon and pentagon. The logarithm of a Drinfeld associator lives in the Lie algbera L generated by the symbols a,b,c modulo [a,b]=[b,c]=[c,a]. The main result is a description of compressed associators that satisfy the compressed pentagon and hexagon in the quotient L/[[L,L],[L,L]]. The key ingredient is an explicit form of Campbell-Baker-Hausdorff formula in the case when all commutators commute.
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https://hal.archives-ouvertes.fr/hal-00013012
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Submitted on : Wednesday, November 2, 2005 - 12:25:14 PM
Last modification on : Friday, June 8, 2018 - 2:50:07 PM

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V. Kurlin. Compressed Drinfeld associators. Geometry, Integrable Systems and Topology, 2005, Glasgow, United Kingdom. ⟨hal-00013012⟩

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