Embeddability and quasi-isometric classification of partially commutative groups

TL;DR

This paper explores an algebraic approach to classify partially commutative groups up to quasi-isometry, proposing a conjecture linking quasi-isometric groups to subgroup relations and confirming it in known cases.

Contribution

It introduces a conjecture connecting quasi-isometry and subgroup structure in partially commutative groups, supported by verification in specific classes.

Findings

Conjecture holds for n-tress and atomic graphs.

Quasi-isometric rigidity relates to algebraic rigidity and co-Hopfian property.

Provides an algebraic perspective on geometric group classification.

Abstract

The main goal of this note is to suggest an algebraic approach to the quasi-isometric classification of partially commutative groups (alias right-angled Artin groups). More precisely, we conjecture that if the partially commutative groups $\mathbb{G}(\Delta)$ and $\mathbb{G}(\Gamma)$ are quasi-isometric, then $\mathbb{G}(\Delta)$ is a (nice) subgroup of $\mathbb{G}(\Gamma)$ and vice-versa. We show that the conjecture holds for all known cases of quasi-isometric classification of partially commutative groups, namely for the classes of $n$-tress and atomic graphs. As in the classical Mostow rigidity theory for irreducible lattices, we relate the quasi-isometric rigidity of the class of atomic partially commutative groups with the algebraic rigidity, that is with the co-Hopfian property of their $\mathbb{Q}$-completions.