A note on asynchronously automatic groups and notions of non-positive curvature

Abstract

We prove groups acting cocompactly on locally finite trees with hyperbolic vertex stabilisers are asynchronously automatic. Combining this with previous work of the authors, we obtain an example of a group satisfying several non-positive curvature properties (being a $\mathrm{CAT}(0)$ group, an injective group, a hierarchically hyperbolic group, and having quadratic Dehn function) which is asynchronously automatic but not biautomatic.

arXiv commentv2: 11 pages, 2 figures, minor changes, to appear in Algebraic & Geometric Topology; v1: 10 pages, 2 figures, comments welcome!