Endomorphisms of the Cuntz algebras

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This mainly expository article is devoted to recent advances in the study of dynamical aspects of the Cuntz algebras O_n, n<infty, via their automorphisms and, more generally, endomorphisms. A combinatorial description of permutative automorphisms of O_n in terms of labeled, rooted trees is presented. This in turn gives rise to an algebraic characterization of the restricted Weyl group of O_n.
It is shown how this group is related to certain classical dynamical systems on
the Cantor set. An identification of the image in Out(O_n) of the restricted Weyl group with the group of automorphisms of the full two-sided n-shift is given, for prime n, providing an answer to a question raised by Cuntz in 1980. Furthermore, we discuss proper endomorphisms of O_n which preserve either the canonical UHF-subalgebra or the diagonal MASA, and present methods for constructing exotic examples of such endomorphisms.
TidsskriftBanach Center Publications
Sider (fra-til)81-97
StatusUdgivet - 2012

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