Multivariate orthogonal polynomials: Quantum decomposition, deficiency rank and support of measure

Ameur Dhahri, Nobuaki Obata, Hyun Jae Yoo

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In this paper we investigate the multivariate orthogonal polynomials based on the theory of interacting Fock spaces. Our framework is on the same stream line of the recent paper by Accardi, Barhoumi, and Dhahri [1]. The (classical) coordinate variables are decomposed into non-commuting (quantum) operators called creation, annihilation, and preservation operators, in the interacting Fock spaces. Getting the commutation relations, which follow from the commuting property of the coordinate variables between themselves, we can develop the reconstruction theory of the measure, namely the Favard's theorem. We then further develop some related problems including the marginal distributions and the rank theory of the Jacobi operators. We will see that the deficiency rank of the Jacobi operator implies that the underlying measure is supported on some algebraic surface and vice versa. We will provide with some examples.

Original languageEnglish
Article number123775
JournalJournal of Mathematical Analysis and Applications
Issue number1
Publication statusPublished - 2020 May 1


  • Deficiency rank
  • Favard theorem
  • Multivariate orthogonal polynomials
  • Quantum decomposition
  • Support of measure


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