Mathematics – Operator Algebras
Scientific paper
2007-07-06
J. Operator Theory 64, no.2, 417-434 (2010)
Mathematics
Operator Algebras
19 pages
Scientific paper
Given a quasi-special endomorphism $\rho$ of a C*-algebra A with nontrivial center, we study an extension problem for automorphisms of A to a minimal cross-product B of A by $\rho$. Exploiting some aspects of the underlying generalized Doplicher-Roberts duality theory based on Pimsner algebras, an obstruction to the existence of such extensions is found and described in terms of sections of a suitable group bundle.
Conti Roberto
Vasselli Ezio
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