Authors: Rösler, Margit
Voit, Michael
Title: Integral representation and sharp asymptotic results for some Heckman-Opdam hypergeometric functions of type BC
Language (ISO): en
Abstract: The Heckman-Opdam hypergeometric functions of type BC extend classical Jacobi functions in one variable and include the spherical functions of non-compact Grassmann manifolds over the real, complex or quaternionic numbers. There are various limit transitions known for such hypergeometric functions, see e.g. [dJ], [RKV]. In the present paper, we use an explicit form of the Harish-Chandra integral representation as well as an interpolated variant, in order to obtain limit results for three continuous classes of hypergeometric functions of type BC which are distinguished by explicit, sharp and uniform error bounds. The first limit realizes the approximation of the spherical functions of infinite dimensional Grassmannians of fixed rank; here hypergeometric functions of type A appear as limits. The second limit is a contraction limit towards Bessel functions of Dunkl type.
Subject Headings: Hypergeometric functions associated with root systems
Grassmann manifolds
spherical functions
Harish-Chandra integral
asymptotic analysis
Bessel functions related to Dunkl operators
Issue Date: 2014-12
Appears in Collections:Preprints der Fakultät für Mathematik

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