Linear representations of Artin groups

2016

Let Г be a Coxeter graph. Let W be the Coxeter group, A be the Artin group, and A+ be the Artin monoid associated with Г. Let G be a group of symmetries of Г. Then G acts on W, A and A+. The fixed subgroup WG is known to be a Coxeter group, the fixed submonoid A+G is known to be an Artin monoid, and, when Г is of spherical type, the fixed subgroup AG is known to be an Artin group. This thesis studies the behavior of WG, A+G and AG with respect to some faithful linear representations of W, A and A+, respectively.Firstly, we consider the rooted representations of the Coxeter groups introduced by Krammer in his Ph. D. Thesis. These are a generalization of the canonical representations. We take…