Quantum Matrix Spherical Functions

Abstract

A general theory of matrix-spherical functions for dual Hopf algebras and right coideal subalgebras is developed. We establish their existence and define their orthogonality relations. When specialized to Kolb and Letzter's quantum symmetric pair coideal subalgebras, we associate, to each classical commutative triple, a unique corresponding quantum commutative triple. This leads to families of vector-valued orthogonal polynomials, which diagonalize a commutative algebra of difference-reflection operators and are invariant under sending $q \mapsto q^{-1}$. Various examples of these vector-valued orthogonal polynomials are given and identified with Intermediate Macdonald polynomials