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Images of fractional Brownian motion with deterministic drift: Positive Lebesgue measure and non-empty interior

Part of: Markov processes

Published online by Cambridge University Press:  28 February 2022

MOHAMED ERRAOUI  and
YOUSSEF HAKIKI
MOHAMED ERRAOUI
Affiliation:
Faculty of Sciences, Route Ben Maachou, B.P. 20, 24000, El Jadida, Morocco. e-mail: [email protected]
YOUSSEF HAKIKI
Affiliation:
Faculty of Science Semlalia, Bd. Prince My Abdellah, B.P. 2390, 40000, Marrakech, Morocco. e-mail: [email protected]
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Abstract

Let $B^{H}$ be a fractional Brownian motion in $\mathbb{R}^{d}$ of Hurst index $H\in\left(0,1\right)$ , $f\;:\;\left[0,1\right]\longrightarrow\mathbb{R}^{d}$ a Borel function and $A\subset\left[0,1\right]$ a Borel set. We provide sufficient conditions for the image $(B^{H}+f)(A)$ to have a positive Lebesgue measure or to have a non-empty interior. This is done through the study of the properties of the density of the occupation measure of $(B^{H}+f)$ . Precisely, we prove that if the parabolic Hausdorff dimension of the graph of f is greater than Hd, then the density is a square integrable function. If, on the other hand, the Hausdorff dimension of A is greater than Hd, then it even admits a continuous version. This allows us to establish the result already cited.

MSC classification

Primary: 60J65: Brownian motion
Type
Research Article
Information
Mathematical Proceedings of the Cambridge Philosophical Society , Volume 173 , Issue 3 , November 2022 , pp. 693 - 713
Copyright
© The Author(s), 2022. Published by Cambridge University Press on behalf of Cambridge Philosophical Society

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