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Springer Verlag, Signal, Image and Video Processing, 7(11), p. 1365-1370

DOI: 10.1007/s11760-017-1094-7

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Numerical proof of existence of fractional powers of Wiener processes

Journal article published in 2014 by Marco Frasca ORCID, Alfonso Farina
This paper is available in a repository.
This paper is available in a repository.

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Abstract

Using the Euler--Maruyama technique, we show that a class of Wiener processes exist that are obtained by computing an arbitrary positive power of them. This can be accomplished with a proper set of definitions that makes meaningful the realization at discrete times of these processes and make them computable. Standard results from It̄o calculus for integer powers hold as we are just extending them. We provide the results from a Monte Carlo simulation with a large number of samples. We yield evidence for the existence of these processes by recovering from them the standard Brownian motion we started with after power elevation. The perfect coincidence of the numerical results we obtained is a clear evidence of existence of these processes. This could pave the way to a generalization of the concepts of stochastic integral and relative process. ; Comment: 12 pages, 4 figures and source code. Changed the title for the sake of correctness