# Structure and $K$-theory of $ℓ_{p}$ uniform Roe algebras

### Yeong Chyuan Chung

Polish Academy of Sciences, Warsaw, Poland### Kang Li

Polish Academy of Sciences, Warsaw, Poland

## Abstract

In this paper, we characterize when the $ℓ_{p}$ uniform Roe algebra of a metric space with bounded geometry is (stably) finite and when it is properly infinite in standard form for $p∈[1,∞)$. Moreover, we show that the $ℓ_{p}$ uniform Roe algebra is a (non-sequential) spatial $L_{p}$ AF algebra in the sense of Phillips and Viola if and only if the underlying metric space has asymptotic dimension zero.

We also consider the ordered $K_{0}$ groups of $ℓ_{p}$ uniform Roe algebras for metric spaces with low asymptotic dimension, showing that (1) the ordered $K_{0}$ group is trivial when the metric space is non-amenable and has asymptotic dimension at most one, and (2) when the metric space is a countable locally finite group, the (ordered) $K_{0}$ group is a complete invariant for the (bijective) coarse equivalence class of the underlying locally finite group. It happens that in both cases the ordered $K_{0}$ group does not depend on $p∈[1,∞)$.

## Cite this article

Yeong Chyuan Chung, Kang Li, Structure and $K$-theory of $ℓ_{p}$ uniform Roe algebras. J. Noncommut. Geom. 15 (2021), no. 2, pp. 581–614

DOI 10.4171/JNCG/405