Mathematics – Operator Algebras
Scientific paper
2009-06-10
Mathematics
Operator Algebras
Scientific paper
Toeplitz CAR flows are a class of E_0-semigroups including the first type III example constructed by R. T. Powers. We show that the Toeplitz CAR flows contain uncountably many mutually non cocycle conjugate E_0-semigroups of type III. We also generalize the type III criterion for Toeplitz CAR flows employed by Powers (and later refined by W. Arveson), and show that Toeplitz CAR flows are always either of type I or type III.
Izumi Masaki
Srinivasan Radhakrishnan
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