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Completely positive maps of order zero

We say a completely positive contractive map between two C*-algebras has order zero, if it sends orthogonal elements to orthogonal elements. We prove a structure theorem for such maps. As a consequence, order zero maps are in one-to-one correspondence with *-homomorphisms from the cone over the domain into the target algebra. Moreover, we conclude that tensor products of order zero maps are again order zero, that the composition of an order zero map with a tracial functional is again a tracial functional, and that order zero maps respect the Cuntz relation, hence induce ordered semigroup morphisms between Cuntz semigroups.

Titel: Completely positive maps of order zero
Verfasser: Winter, Wilhelm
Zacharias, Joachim
Organisation: FB 10: Mathematik und Informatik
Dokumenttyp: Artikel
Medientyp: Text
Erscheinungsdatum: 2009
Publikation in MIAMI: 20.08.2009
Datum der letzten Änderung: 11.05.2015
Zeitschrift/Periodikum: Münster Journal of Mathematics / 2 (2009), S. 311 - 324
Fachgebiete: Mathematik
Sprache: Englisch
Format: PDF-Dokument
URN: urn:nbn:de:hbz:6-10569444087
Permalink: https://nbn-resolving.org/urn:nbn:de:hbz:6-10569444087
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