Poincaré profiles of Lie groups and a coarse geometric dichotomy

David Hume, John M Mackay, Romain Tessera*

*Corresponding author for this work

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

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Poincaré profiles are analytically defined invariants, which provide obstructions to the existence of coarse embeddings between metric spaces. We calculate them for all connected unimodular Lie groups, Baumslag–Solitar groups and Thurston geometries, demonstrating two substantially different types of behaviour. For Lie groups, our dichotomy extends both the rank one versus higher rank dichotomy for semisimple Lie groups and the polynomial versus exponential growth dichotomy for solvable unimodular Lie groups. We provide equivalent algebraic, quasi-isometric and coarse geometric formulations of this dichotomy. As a consequence, we deduce that for groups of the form N×S, where N is a connected nilpotent Lie group, and S is a rank one simple Lie group, both the growth exponent of N, and the conformal dimension of S are non-decreasing under coarse embeddings. These results are new even for quasi-isometric embeddings and give obstructions which in many cases improve those previously obtained by Buyalo–Schroeder.
Original languageEnglish
Pages (from-to)1063–1133
Number of pages71
JournalGeometric and Functional Analysis
Issue number5
Publication statusPublished - 27 Sept 2022

Bibliographical note

Funding Information:
The first author was supported by a Titchmarsh Research Fellowship at the University of Oxford and a Heilbronn Research Fellowship at the University of Bristol. The second author was supported in part by EPSRC Grant EP/P010245/1.

Publisher Copyright:
© 2022, The Author(s).


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