Partial-isometric crossed products by semigroups of endomorphisms

Details Partial-isometric crossed products by semigroups of endomorphisms Partial-isometric crossed products by semigroups of endomorphisms

2002-10-23

arxiv.org/abs/math/0210364v1

Mathematics

Operator Algebras

26 pages

Scientific paper

Let $\Gamma^+$ be the positive cone in a totally ordered abelian group $\Gamma$, and let $\alpha$ be an action of $\Gamma^+$ by endomorphisms of a $C^*$-algebra $A$. We consider a new kind of crossed-product $C^*$-algebra $A\times_\alpha\Gamma^+$, which is generated by a faithful copy of $A$ and a representation of $\Gamma^+$ as partial isometries. We claim that these crossed products provide a rich and tractable family of Toeplitz algebras for product systems of Hilbert bimodules, as recently studied by Fowler, and we illustrate this by proving detailed structure theorems for actions by forward and backward shifts.

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