Quantum Zonal Spherical Functions and Macdonald Polynomials

Details Quantum Zonal Spherical Functions and Macdonald Polynomials Quantum Zonal Spherical Functions and Macdonald Polynomials

2002-10-29

arxiv.org/abs/math/0210447v2

Mathematics

Quantum Algebra

Minor revisions, changes to section 7

Scientific paper

A unified theory of quantum symmetric pairs is applied to q-special functions. Previous work characterized certain left coideal subalgebras in the quantized enveloping algebra and established an appropriate framework for quantum zonal spherical functions. Here a distinguished family of such functions, invariant under the Weyl group associated to the restricted roots, is shown to be a family of Macdonald polynomials, as conjectured by Koornwinder and Macdonald. Our results place earlier work for Lie algebras of classical type in a general context and extend to the exceptional cases.

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