Low-dimensional linear representations of mapping class groups

Details Low-dimensional linear representations of mapping class groups Low-dimensional linear representations of mapping class groups

2011-04-25

arxiv.org/abs/1104.4816v2

Mathematics

Geometric Topology

A section on Aut$F_n$ and two corollaries are added

Scientific paper

Recently, John Franks and Michael Handel proved that, for $g\geq 3$ and $n\leq 2g-4$, every homomorphism from the mapping class group of an orientable surface of genus $g$ to $\GL (n,\C)$ is trivial. We extend this result to $n\leq 2g-1$, also covering the case $g=2$. As an application, we prove the corresponding result for nonorientable surfaces. Another application is on the triviality of homomorphisms from the mapping class group of a closed surface of genus $g$ to $\Aut (F_n)$ or to $\Out (F_n)$ for $n\leq 2g-1$.

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