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Titelaufnahme

  • Titel
    Completely positive maps of order zero
  • Verfasser
    Winter, Wilhelm ; Zacharias, Joachim
  • Enthalten in
    Münster Journal of Mathematics, H. Münster Journal of Mathematics, S. 311-324
  • Erschienen
    2009
  • Sprache
    Englisch
  • Dokumenttyp
    Aufsatz in einer Zeitschrift
  • URN
    urn:nbn:de:hbz:6-10569444087 
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Abstract
  • 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.
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