Spherical Zone t-Designs for Numerical Integration and Approximation

Abstract

SIAM Journal on Numerical Analysis, Volume 63, Issue 5, Page 2072-2093, October 2025.
Abstract. In this paper, we present spherical zone [math]-designs, which provide quadrature rules with equal weight for spherical polynomials of degree at most [math] on a spherical zone [math] with [math] and [math]. The spherical zone [math]-design is constructed by combining spherical [math]-designs and trapezoidal rules on [math] with polynomial exactness [math]. We show that the spherical zone [math]-designs using spherical [math]-designs only provide quadrature rules with equal weight for spherical zonal polynomials of degree at most [math] on the spherical zone. We apply the proposed spherical zone [math]-designs to numerical integration, hyperinterpolation and sparse approximation on the spherical zone. Theoretical approximation error bounds are presented. Some numerical examples are given to illustrate the theoretical results and show the efficiency of the proposed spherical zone [math]-designs.