Dualities in the $q$-Askey scheme and degenerate DAHA

TL;DR

This paper explores the duality properties of Askey-Wilson polynomials and their associated algebraic structures, including degenerations to simpler cases and the relations with degenerate double affine Hecke algebras.

Contribution

It systematically studies the degeneration process of Askey-Wilson polynomials and their algebraic frameworks, revealing dualities and connections with degenerate DAHA structures.

Findings

Duality persists in degenerate cases

Degenerate Askey-Wilson algebras relate to simplified polynomial families

Connections established between non-symmetric polynomials and degenerate DAHA

Abstract

The Askey-Wilson polynomials are a four-parameter family of orthogonal symmetric Laurent polynomials $R_n[z]$ which are eigenfunctions of a second-order $q$-difference operator $L$, and of a second-order difference operator in the variable $n$ with eigenvalue $z +z^{-1}=2x$. Then $L$ and multiplication by $z+z^{-1}$ generate the Askey-Wilson (Zhedanov) algebra. A nice property of the Askey-Wilson polynomials is that the variables $z$ and $n$ occur in the explicit expression in a similar and to some extent exchangeable way. This property is called duality. It returns in the non-symmetric case and in the underlying algebraic structures: the Askey-Wilson algebra and the double affine Hecke algebra (DAHA). In this paper we follow the degeneration of the Askey-Wilson polynomials until two arrows down and in four different situations: for the orthogonal polynomials themselves, for the degenerate Askey-Wilson algebras, for the non-symmetric polynomials and for the (degenerate) DAHA and its representations.