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Fractional Brownian motion with deterministic drift: how critical is drift regularity in hitting probabilities

Part of: Classical measure theory Stochastic processes Markov processes

Published online by Cambridge University Press:  20 February 2025

MOHAMED ERRAOUI  and
YOUSSEF HAKIKI
MOHAMED ERRAOUI
Affiliation:
Department of mathematics, Faculty of science El jadida, Chouaïb Doukkali University, Route Ben Maachou, 24000, El Jadida, Morocco. e-mail: erraoui.mohamed@ucd.ac.ma
YOUSSEF HAKIKI
Affiliation:
Department of Mathematics, Purdue University, 150 N. University Street, W. Lafayette, IN 47907, U.S.A. e-mail: yhakiki@purdue.edu
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Abstract

Let $B^{H}$ be a d-dimensional fractional Brownian motion with Hurst index $H\in(0,1)$, $f\,:\,[0,1]\longrightarrow\mathbb{R}^{d}$ a Borel function, and $E\subset[0,1]$, $F\subset\mathbb{R}^{d}$ are given Borel sets. The focus of this paper is on hitting probabilities of the non-centered Gaussian process $B^{H}+f$. It aims to highlight how each component f, E and F is involved in determining the upper and lower bounds of $\mathbb{P}\{(B^H+f)(E)\cap F\neq \emptyset \}$. When F is a singleton and f is a general measurable drift, some new estimates are obtained for the last probability by means of suitable Hausdorff measure and capacity of the graph $Gr_E(f)$. As application we deal with the issue of polarity of points for $(B^H+f)\vert_E$ (the restriction of $B^H+f$ to the subset $E\subset (0,\infty)$).

MSC classification

Primary: 60G22: Fractional processes, including fractional Brownian motion 60G17: Sample path properties
Secondary: 60J45: Probabilistic potential theory 28A78: Hausdorff and packing measures

Information

Type
Research Article
Information
Mathematical Proceedings of the Cambridge Philosophical Society , Volume 178 , Issue 1 , January 2025 , pp. 103 - 132
Copyright
© The Author(s), 2025. Published by Cambridge University Press on behalf of Cambridge Philosophical Society

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