Poincaré profiles of groups and spaces

David Hume, John M. Mackay, Romain Tessera

Research output: Contribution to journalArticle (Academic Journal)peer-review

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Abstract

We introduce a spectrum of monotone coarse invariants for metric measure spaces called Poincaré profiles. The two extremes of this spectrum determine the growth of the space, and the separation profile as defined by Benjamini--Schramm--Timár. In this paper we focus on properties of the Poincaré profiles of groups with polynomial growth, and of hyperbolic spaces, where we deduce a connection between these profiles and conformal dimension. As applications, we use these invariants to show the non-existence of coarse embeddings in a variety of examples.
Original languageEnglish
Pages (from-to)1835-1886
Number of pages52
JournalRevista Matemática Iberoamericana
Volume36
Issue number6
Early online date2 Mar 2020
DOIs
Publication statusE-pub ahead of print - 2 Mar 2020

Keywords

  • hyperbolic groups
  • nilpotent groups
  • Poincaré inequality
  • expanders
  • coarse invariant

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