Autor(en): Rösler, Margit
Voit, Michael
Titel: A multivariate version of the disk convolution
Sprache (ISO): en
Zusammenfassung: We present an explicit product formula for the spherical functions of the compact Gelfand pairs (G,K_1) = (SU(p + q), SU(p) × SU(q)) with p ≥ 2q, which can be considered as the elementary spherical functions of one-dimensional K-type for the Hermitian symmetric spaces G/K with K = S(U(p) × U(q)). Due to results of Heckman, they can be expressed in terms of Heckman-Opdam Jacobi polynomials of type BC_q with specific half-integer multiplicities. By analytic continuation with respect to the multiplicity parameters we obtain positive product formulas for the extensions of these spherical functions as well as associated compact and commutative hypergroup structures parametrized by real p ∈]2q−1,∞[. We also obtain explicit product formulas for the involved continuous two-parameter family of Heckman-Opdam Jacobi polynomials with regular, but not necessarily positive multiplicities. The results of this paper extend well known results for the disk convolutions for q = 1 to higher rank.
Schlagwörter: hypergeometric functions associated with root systems
Heckman-Opdam theory
Jacobi polynomials
disk hypergroups
positive product formulas
compact Grassmann manifolds
spherical functions
URI: http://hdl.handle.net/2003/34075
http://dx.doi.org/10.17877/DE290R-7434
Erscheinungsdatum: 2015-04
Enthalten in den Sammlungen:Preprints der Fakultät für Mathematik

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