The Lawrence-Krammer representation

Details The Lawrence-Krammer representation The Lawrence-Krammer representation

2002-04-04

arxiv.org/abs/math/0204057v1

Mathematics

Geometric Topology

20 pages, 9 figures

Scientific paper

The Lawrence-Krammer representation of the braid groups recently came to prominence when it was shown to be faithful by myself and Krammer. It is an action of the braid group on a certain homology module $H_2(\tilde{C})$ over the ring of Laurent polynomials in $q$ and $t$. In this paper we describe some surfaces in $\tilde{C}$ representing elements of homology. We use these to give a new proof that $H_2(\tilde{C})$ is a free module. We also show that the $(n-2,2)$ representation of the Temperley-Lieb algebra is the image of a map to relative homology at $t=-q^{-1}$, clarifying work of Lawrence.

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