Commensurability of geometric subgroups of mapping class groups

Details Commensurability of geometric subgroups of mapping class groups Commensurability of geometric subgroups of mapping class groups

2007-07-23

arxiv.org/abs/0707.3430v1

Mathematics

Geometric Topology

Scientific paper

Let M be a surface (possibly nonorientable) with punctures and/or boundary components. The paper is a study of ``geometric subgroups'' of the mapping class group of M, that is subgroups corresponding to inclusions of subsurfaces (possibly disconnected). We characterise the subsurfaces which lead to virtually abelian geometric subgroups. We provide algebraic and geometric conditions under which two geometric subgroups are commensurable. We also describe the commensurator of a geometric subgroup in terms of the stabiliser of the underlying subsurface. Finally, we show some applications of our analysis to the theory of irreducible unitary representations of mapping class groups.

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