Opdam's hypergeometric functions: product formula and convolution structure in dimension 1

Details Opdam's hypergeometric functions: product formula and convolution structure in dimension 1 Opdam's hypergeometric functions: product formula and convolution structure in dimension 1

2010-04-29

arxiv.org/abs/1004.5203v3

Mathematics

Classical Analysis and ODEs

Adv. Pure Appl. Math. (2011) 27 pp

Scientific paper

Let $G_{\lambda}^{(\alpha,\beta)}$ be the eigenfunctions of the Dunkl-Cherednik operator $T^{(\alpha,\beta)}$ on $\mathbb{R}$. In this paper we express the product $G_{\lambda}^{(\alpha,\beta)}(x)G_{\lambda}^{(\alpha,\beta)}(y)$ as an integral in terms of $G_{\lambda}^{(\alpha,\beta)}(z)$ with an explicit kernel. In general this kernel is not positive. Furthermore, by taking the so-called rational limit, we recover the product formula of M. R\"osler for the Dunkl kernel. We then define and study a convolution structure associated to $G_{\lambda}^{(\alpha,\beta)}$.

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