Abstract
A full-discrete scheme is presented for a Langevin equation involving Caputo fractional derivative and additive white noise. Based on a spectral truncation of white noise, the fractional Langevin equation is converted to an approximate equation with random parameters and a finite difference scheme is constructed. Consistency of the approximate equation as well as error estimate of the finite difference scheme are obtained. It is proved that when spectral truncation level and the step size are inversely proportional, the convergence order of the finite difference scheme is 1.5 in mean-square sense and independent of the value of fractional derivative order. Numerical examples verify the theoretical analysis. Moreover, to fulfill long-time simulation, a scheme based on piecewise spectral approximation of white noise is further developed.
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Acknowledgements
The authors would like to thank Prof. Guofei Pang for his valuable comments and suggestions.
Funding
This work was supported by the National Natural Science Foundation of China (No. 12071073). The first author was also supported by Postgraduate Research & Practice Innovation Program of Jiangsu Province, China (No. KYCX22_0235).
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Wanrong Cao: Writing — reviewing and editing, funding acquisition, conceptualization, resources, supervision. Yibo Wang: writing — original draft, software, formal analysis.
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Wang, Y., Cao, W. Strong 1.5 order scheme for fractional Langevin equation based on spectral approximation of white noise. Numer Algor 95, 423–450 (2024). https://doi.org/10.1007/s11075-023-01576-z
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DOI: https://doi.org/10.1007/s11075-023-01576-z
Keywords
- Stochastic differential equations
- Caputo fractional derivative
- Wong-Zakai approximation
- Finite difference method
- Laplace and inverse Laplace transform