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Morita equivalent twisted actions and a new version of the Packer-Raeburn stabilization trick. (English) Zbl 0807.46081
Summary: We show that every twisted action \((\alpha,\tau)\) of a locally compact group \(G\) on a \(C^*\)-algebra \(A\) is Morita equivalent to an ordinary action of \(G/N_ \tau\), where \(N_ \tau\) is the domain of \(\tau\). This result allows us to apply many results known for ordinary covariant systems to the more general twisted case. Especially, this is true for results which are obtained by the Mackey machine.

MSC:
46L55 Noncommutative dynamical systems
46L40 Automorphisms of selfadjoint operator algebras
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