On the representation theory of braid groups

Details On the representation theory of braid groups On the representation theory of braid groups

2005-02-06

arxiv.org/abs/math/0502118v3

Mathematics

Representation Theory

49 pages ; a source file had unfortunately been overwritten in the previous replacement

Scientific paper

This work presents an approach towards the representation theory of the braid groups $B_n$. We focus on finite-dimensional representations over the field of Laurent series which can be obtained from representations of infinitesimal braids, with the help of Drinfeld associators. We set a dictionary between representation-theoretic properties of these two structures, and tools to describe the representations thus obtained. We give an explanation for the frequent apparition of unitary structures on classical representations. We introduce new objects -- varieties of braided extensions, infinitesimal quotients -- which are useful in this setting, and analyse several of their properties. Finally, we review the most classical representations of the braid groups, show how they can be obtained by our methods and how this setting enrich our understanding of them.

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