Asymptotic linearity of the mapping class group and a homological version of the Nielsen-Thurston classification

Details Asymptotic linearity of the mapping class group and a homological version of the Nielsen-Thurston classification Asymptotic linearity of the mapping class group and a homological version of the Nielsen-Thurston classification

2009-02-17

arxiv.org/abs/0902.2810v6

Mathematics

Geometric Topology

Revision, 27 pages

Scientific paper

We study the action of the mapping class group on the real homology of finite covers of a topological surface. We use the homological representation of the mapping class to construct a faithful infinite-dimensional representation of the mapping class group. We show that this representation detects the Nielsen-Thurston classification of each mapping class. We then discuss some examples that occur in the theory of braid groups and develop an analogous theory for automorphisms of free groups. We close with some open problems.

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