A New Look at The Crossed-Product of a C*-algebra by an Endomorphism

Details A New Look at The Crossed-Product of a C*-algebra by an Endomorphism A New Look at The Crossed-Product of a C*-algebra by an Endomorphism

2000-12-12

arxiv.org/abs/math/0012084v1

Mathematics

Operator Algebras

14 pages, Plain TeX

Scientific paper

We give a new definition for the crossed-product of a C*-algebra A by a *-endomorphism \alpha, which depends not only on the pair (A,\alpha) but also on the choice of a transfer operator (defined in the paper). With this we generalize some of the earlier constructions in the situations in which they behave best (e.g. for monomorphisms with hereditary range), but we get a different and perhaps more natural outcome in other situations. For example, we show that the Cuntz-Krieger algebra O_A arises as the result of our construction when applied to the corresponding Markov subshift and a very natural transfer operator.

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