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Constructing group actions on quasi-trees and applications to mapping class groups

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arxiv 1006.1939 v5 pith:ATACGMVE submitted 2010-06-10 math.GR math.GT

classification math.GRmath.GT
keywords groupsclassmappingactionsfinitehyperbolicquasi-isometricquasi-trees
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A quasi-tree is a geodesic metric space quasi-isometric to a tree. We give a general construction of many actions of groups on quasi-trees. The groups we can handle include non-elementary (relatively) hyperbolic groups, rank 1 CAT(0) groups, mapping class groups and Out(Fn). As an application, we show that mapping class groups act on finite products of {\delta}-hyperbolic spaces so that orbit maps are quasi-isometric embeddings. We prove that mapping class groups have finite asymptotic dimension.

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Cited by 1 Pith paper

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Growth gaps and exponential genericity in acylindrically hyperbolic groups

    math.GR 2026-07 conditional novelty 8.0 of 10

    WPD elements are exponentially generic for every finite generating set of an acylindrically hyperbolic group, yielding growth tightness and cogrowth tightness.

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