An expansion formula for the Askey-Wilson function
Abstract
The Askey-Wilson function transform is a q-analogue of the Jacobi function transform with kernel given by an explicit non-polynomial eigenfunction of the Askey-Wilson second order q-difference operator. The kernel is called the Askey-Wilson function. In this paper an explicit expansion formula for the Askey-Wilson function in terms of Askey-Wilson polynomials is proven. With this expansion formula at hand, the image under the Askey-Wilson function transform of an Askey-Wilson polynomial multiplied by an analogue of the Gaussian is computed explicitly. As a special case of these formulas a q-analogue (in one variable) of the Macdonald-Mehta integral is obtained, for which also two alternative, direct proofs are presented.
Cite
@article{arxiv.math/0105093,
title = {An expansion formula for the Askey-Wilson function},
author = {Jasper V. Stokman},
journal= {arXiv preprint arXiv:math/0105093},
year = {2007}
}
Comments
24 pages. Some remarks added in section 6 on the connection with moment problems