Sklyanin-like algebras for ($q$-)linear grids and ($q$-)para-Krawtchouk polynomials

Abstract

S-Heun operators on linear and $q$-linear grids are introduced. These operators are special cases of Heun operators and are related to Sklyanin-like algebras. The Continuous Hahn and Big $q$-Jacobi polynomials are functions on which these S-Heun operators have natural actions. We show that the S-Heun operators encompass both the bispectral operators and Kalnins and Miller's structure operators. These four structure operators realize special limit cases of the trigonometric degeneration of the original Sklyanin algebra. Finite-dimensional representations of these algebras are obtained from a truncation condition. The corresponding representation bases are finite families of polynomials: the para-Krawtchouk and $q$-para-Krawtchouk ones. A natural algebraic interpretation of these polynomials that had been missing is thus obtained. We also recover the Heun operators attached to the corresponding bispectral problems as quadratic combinations of the S-Heun operators

arXiv comment22 pages, few references updated/added; accepted version for publication

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Cited by in corpus (4)

• Bispectrality and biorthogonality of the rational functions of $q$-Hahn type
• The rational Sklyanin algebra and the Wilson and para-Racah polynomials
• Elliptic Racah polynomials
• Orthogonal polynomials and the deformed Jordan plane