Year: 2026
Type: preprint
Abstract: We show that the canonical embeddings of the Jiang--Su algebra $\mathcal Z$ into the universal unital free product $\mathcal Z \ast_{\mathbb C}\mathcal Z$ are not approximately unitarily equivalent. This answers a question appearing in one of the $99$ problems list of Schafhauser, Tikuisis, and White. By contrast, we prove that any two such embeddings into a selfless $\mathrm{C}^\ast$-algebra are strongly asymptotically unitarily equivalent.
Source: arXiv (Cornell University)
Author: Pagliero, Matteo
Institution: University of Southern Denmark
Language: English
Subfield: Mathematical Physics
Field: Mathematics
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W7216305546