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Displaying similar documents to “Remarks on tensor proucts and their applications in quantum theory - II. Spectral properties”

Twisted spectral triples and covariant differential calculi

Ulrich Krähmer, Elmar Wagner (2011)

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Connes and Moscovici recently studied "twisted" spectral triples (A,H,D) in which the commutators [D,a] are replaced by D∘a - σ(a)∘D, where σ is a second representation of A on H. The aim of this note is to point out that this yields representations of arbitrary covariant differential calculi over Hopf algebras in the sense of Woronowicz. For compact quantum groups, H can be completed to a Hilbert space and the calculus is given by bounded operators. At the end, we discuss an explicit...

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Acta Universitatis Carolinae. Mathematica et Physica

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When is a quantum space not a group?

Piotr Mikołaj Sołtan (2010)

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We give a survey of techniques from quantum group theory which can be used to show that some quantum spaces (objects of the category dual to the category of C*-algebras) do not admit any quantum group structure. We also provide a number of examples which include some very well known quantum spaces. Our tools include several purely quantum group theoretical results as well as study of existence of characters and traces on C*-algebras describing the considered quantum spaces as well as...