Plane wave formulas for spherical, complex and symplectic harmonics

JOURNAL OF APPROXIMATION THEORY

卷:222

Article

De Bie, H.¹  Sommen, F.¹  Wutzig, M.¹ 

[1] Univ Ghent, Fac Engn & Architecture, Dept Math Anal, Krijgslaan 281, B-9000 Ghent, Belgium

关键词: Reproducing kernels;    Spherical harmonics;    Symplectic harmonics;    Pizzetti formulas;    Plane waves;    Stiefel manifolds;   

DOI  :  10.1016/j.jat.2017.07.001

来源: Elsevier

【 摘 要 】

This paper is concerned with spherical harmonics, and two refinements thereof: complex harmonics and symplectic harmonics. The reproducing kernels of the spherical and complex harmonics are explicitly given in terms of Gegenbauer or Jacobi polynomials. In the first part of the paper we determine the reproducing kernel for the space of symplectic harmonics, which is again expressible as a Jacobi polynomial of a suitable argument. In the second part we find plane wave formulas for the reproducing kernels of the three types of harmonics, expressing them as suitable integrals over Stiefel manifolds. This is achieved using Pizzetti formulas that express the integrals in terms of differential operators. (C) 2017 Elsevier Inc. All rights reserved.

【 授权许可】

Free