On Approximation for Fractional Stochastic Partial Differential Equations on the Sphere

Abstract

This paper gives the exact solution in terms of the Karhunen-Loève expansion to a fractional stochastic partial differential equation on the unit sphere ${\mathbb{S}}^2\subset {\mathbb{R}}^3$ with fractional Brownian motion as driving noise and with random initial condition given by a fractional stochastic Cauchy problem. A numerical approximation to the solution is given by truncating the Karhunen-Loève expansion. We show the convergence rates of the truncation errors in degree and the mean square approximation errors in time. Numerical examples using an isotropic Gaussian random field as initial condition and simulations of evolution of cosmic microwave background (CMB) are given to illustrate the theoretical results.

arXiv comment28 pages, 7 figures

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• Analysis of Spherical Monofractal and Multifractal Random Fields
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• Isotropic Q-fractional Brownian motion on the sphere: regularity and fast simulation
• Models of space-time random fields on the sphere
• Quadratic variations for Gaussian isotropic random fields on the sphere