Poisson boundaries over locally compact quantum groups

Mehrdad Kalantar, Matthias Neufang, Zhong Jin Ruan

Research output: Contribution to journalArticlepeer-review


We present versions of several classical results on harmonic functions and Poisson boundaries in the setting of locally compact quantum groups. In particular, the Choquet-Deny theorem holds for compact quantum groups; also, the result of Kaimanovich-Vershik and Rosenblatt, which characterizes group amenability in terms of harmonic functions, admits a noncommutative analogue in the separable case. We also explore the relation between classical and quantum Poisson boundaries by investigating the spectrum of the quantum group. We apply this machinery to find a concrete realization of the Poisson boundaries of the compact quantum group SUq(2) arising from measures on its spectrum.

Original languageEnglish (US)
Article number1350023
JournalInternational Journal of Mathematics
Issue number3
StatePublished - Mar 2013


  • Choquet-Deny theorem
  • Poisson boundary
  • amenability
  • harmonic functions
  • locally compact quantum groups

ASJC Scopus subject areas

  • General Mathematics


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