N-step energy of maps and the fixed-point property of random groups

Hiroyasu Izeki, Takefumi Kondo, Shin Nayatani

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

We prove that a random group of the graph model associated with a sequence of expanders has the fixed-point property for a certain class of CAT(0) spaces. We use Gromov's criterion for the fixed-point property in terms of the growth of n-step energy of equivariant maps from a finitely generated group into a CAT(0) space, for which we give a detailed proof. We estimate a relevant geometric invariant of the tangent cones of the Euclidean buildings associated with the groups PGL(m,Qr), and deduce from the general result above that the same random group has the fixed-point property for all of these Euclidean buildings with m bounded from above.

Original languageEnglish
Pages (from-to)701-736
Number of pages36
JournalGroups, Geometry, and Dynamics
Volume6
Issue number4
DOIs
Publication statusPublished - 2012 Dec 1

Keywords

  • CAT(0) space
  • Energy of map
  • Euclidean building
  • Expander
  • Finitely generated group
  • Fixed-point property
  • Random group
  • Wang invariant

ASJC Scopus subject areas

  • Geometry and Topology
  • Discrete Mathematics and Combinatorics

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