Automorphisms of the UHF algebra that do not extend to the Cuntz algebra
Operator Algebras
2011-04-12 v1 Dynamical Systems
Functional Analysis
Abstract
Automorphisms of the canonical core UHF-subalgebra F_n of the Cuntz algebra O_n do not necessarily extend to automorphisms of O_n. Simple examples are discussed within the family of infinite tensor products of (inner) automorphisms of the matrix algebras M_n. In that case, necessary and sufficient conditions for the extension property are presented. It is also addressed the problem of extending to O_n the automorphisms of the diagonal D_n, which is a regular MASA with Cantor spectrum. In particular, it is shown the existence of product-type automorphisms of D_n that are not extensible to (possibly proper) endomorphisms of O_n.
Cite
@article{arxiv.1003.1815,
title = {Automorphisms of the UHF algebra that do not extend to the Cuntz algebra},
author = {Roberto Conti},
journal= {arXiv preprint arXiv:1003.1815},
year = {2011}
}