Two new constructions in the theory of projection complexes

2024/04/03 by Nairne, Patrick S.
#20F65 #30L05 #51F30 #FOS: Mathematics #Group Theory (math.GR)

paper · doi:10.48550/arxiv.2404.02730

Abstract

In this paper we provide two new constructions that are useful for the theory of projection complexes developed by Bestvina, Bromberg, Fujiwara and Sisto. We prove that there exists a subtree of the projection complex which is quasiisometric to the projection complex. We use this subtree to form a tree of metric spaces, which is a subgraph of the quasi-tree of metrics spaces and quasiisometric to it. These constructions simplify the metric structure (up to quasiisometry) of the projection complex and the quasi-tree of metric spaces. As an application, we use these constructions to provide a shorter proof of Hume's theorem that the mapping class group admits a quasiisometric embedding into a finite product of trees.

Related

• Projection complexes and quasimedian maps
• Proper actions on finite products of quasi-trees
• Embedding mapping class groups into finite products of trees
• Constructing group actions on quasi-trees and applications to mapping class groups
• Geometry and rigidity of mapping class groups