Year: 2026
Type: preprint
Abstract: Building on the Roe algebra framework developed in the first paper of this series, we construct equivariant coarse index maps for locally compact Hausdorff spaces equipped with proper actions of {é}tale groupoids, with coefficients in any separable groupoid C* -algebra. The construction uses the coarse structures determined by the groupoid action and requires no choice of metric. By identifying Roe algebras of canonical modules with reduced crossed products, we prove that the Baum-Connes assembly map with coefficients factors through the coarse index map.
Source: arXiv (Cornell University)
Author: Mao, Kai
Institution: Institut Élie Cartan de Lorraine
Language: English
Subfield: Mathematical Physics
Field: Mathematics
Domain: Physical Sciences
Open Access status: green
Funder: Agence Nationale de la Recherche
OpenAlex ID: W7223191097