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An approximate equivalence for the GNS representation of the Haar state of \(SU_{q}(2)\)

  • Partha Sarathi Chakraborty,
  • Arup Kumar Pal

摘要

We use the crystallised \(C^*\) C -algebra \(C(SU_{q}(2))\) C ( S U q ( 2 ) ) at \(q=0\) q = 0 to obtain a unitary that gives an approximate equivalence involving the GNS representation on the \(L^{2}\) L 2 space of the Haar state of the quantum SU(2) group and the direct integral of all the infinite dimensional irreducible representations of the \(C^{*}\) C -algebra \(C(SU_{q}(2))\) C ( S U q ( 2 ) ) for nonzero values of the parameter q. This approximate equivalence gives a KK class via the Cuntz picture in terms of quasihomomorphisms as well as a Fredholm representation of the dual quantum group \(\widehat{SU_q(2)}\) S U q ( 2 ) ^ with coefficients in a \(C^*\) C -algebra in the sense of Mishchenko.