Skip to Main Content


AMS eBook CollectionsOne of the world's most respected mathematical collections, available in digital format for your library or institution


Hitting probabilities for nonlinear systems of stochastic waves

About this Title

Robert C. Dalang, Institut de Mathématiques, Ecole Polytechnique Fédérale de Lausanne, Station 8, CH-1015 Lausanne, Switzerland and Marta Sanz-Solé, Facultat de Matemàtiques, Universitat de Barcelona, Gran Via de les Corts Catalanes 585, 08007 Barcelona, Spain

Publication: Memoirs of the American Mathematical Society
Publication Year: 2015; Volume 237, Number 1120
ISBNs: 978-1-4704-1423-8 (print); 978-1-4704-2507-4 (online)
DOI: https://doi.org/10.1090/memo/1120
Published electronically: January 22, 2015
Keywords: Hitting probabilities, systems of stochastic wave equations, spatially homogeneous Gaussian noise, capacity, Hausdorff measure
MSC: Primary 60H15, 60J45; Secondary 60G15, 60H07, 60G60

View full volume PDF

View other years and numbers:

Table of Contents

Chapters

  • 1. Introduction
  • 2. Upper bounds on hitting probabilities
  • 3. Conditions on Malliavin matrix eigenvalues for lower bounds
  • 4. Study of Malliavin matrix eigenvalues and lower bounds
  • A. Technical estimates

Abstract

We consider a $d$-dimensional random field $u = \{u(t,x)\}$ that solves a nonlinear system of stochastic wave equations in spatial dimensions $k \in \{1,2,3\}$, driven by a spatially homogeneous Gaussian noise that is white in time. We mainly consider the case where the spatial covariance is given by a Riesz kernel with exponent $\beta$. Using Malliavin calculus, we establish upper and lower bounds on the probabilities that the random field visits a deterministic subset of $\mathbb {R}^d$, in terms, respectively, of Hausdorff measure and Newtonian capacity of this set. The dimension that appears in the Hausdorff measure is close to optimal, and shows that when $d(2-\beta ) > 2(k+1)$, points are polar for $u$. Conversely, in low dimensions $d$, points are not polar. There is however an interval in which the question of polarity of points remains open.

References [Enhancements On Off] (What's this?)

References