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Theory of Probability and Mathematical Statistics

ISSN 1547-7363(online) ISSN 0094-9000(print)

   
 
 

 

Fractional stochastic partial differential equation for random tangent fields on the sphere


Authors: V. V. Anh, A. Olenko and Y. G. Wang
Journal: Theor. Probability and Math. Statist. 104 (2021), 3-22
MSC (2020): Primary 35R60, 60H15, 35R11; Secondary 60G60, 33C55, 60G22
DOI: https://doi.org/10.1090/tpms/1142
Published electronically: September 24, 2021
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Abstract: This paper develops a fractional stochastic partial differential equation (SPDE) to model the evolution of a random tangent vector field on the unit sphere. The SPDE is governed by a fractional diffusion operator to model the Lévy-type behaviour of the spatial solution, a fractional derivative in time to depict the intermittency of its temporal solution, and is driven by vector-valued fractional Brownian motion on the unit sphere to characterize its temporal long-range dependence. The solution to the SPDE is presented in the form of the Karhunen–Loève expansion in terms of vector spherical harmonics. Its covariance matrix function is established as a tensor field on the unit sphere that is an expansion of Legendre tensor kernels. The variance of the increments and approximations to the solutions are studied and convergence rates of the approximation errors are given. It is demonstrated how these convergence rates depend on the decay of the power spectrum and variances of the fractional Brownian motion.


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Additional Information

V. V. Anh
Affiliation: Faculty of Science, Engineering and Technology, Swinburne University of Technology, PO Box 218, Hawthorn, Victoria 3122, Australia
Email: vanh@swin.edu.au

A. Olenko
Affiliation: Department of Mathematics and Statistics, La Trobe University, Melbourne, VIC 3086, Australia
Email: a.olenko@latrobe.edu.au

Y. G. Wang
Affiliation: Max Planck Institute for Mathematics in the Sciences, Inselstrasse 22, 04103 Leipzig, Germany
Address at time of publication: Institute of Natural Sciences, School of Mathematical Sciences, and Key Laboratory of Scientific and Engineering Computing of Ministry of Education (MOE-LSC), Shanghai Jiao Tong University, Shanghai 200240, People’s Republic of China
Email: yuguang.wang@mis.mpg.de

Keywords: Fractional stochastic partial differential equation, random tangent field, vector spherical harmonics, fractional Brownian motion
Received by editor(s): April 23, 2021
Published electronically: September 24, 2021
Additional Notes: This research was partially supported under the Australian Research Council’s Discovery Projects funding scheme (project number DP160101366). The third author acknowledges the support of funding from the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation programme (grant agreement no 757983)
Article copyright: © Copyright 2021 Taras Shevchenko National University of Kyiv