Hitting Probabilities for Systems of Non-Linear Stochastic Heat Equations with Additive Noise

Dalang, Robert C.; Khoshnevisan, Davar; Nualart, Eulalia

Hitting Probabilities for Systems of Non-Linear Stochastic Heat Equations with Additive Noise

Authors

Dalang, Robert C.

Khoshnevisan, Davar

Nualart, Eulalia

Description

We consider a system of $d$ coupled non-linear stochastic heat equations in spatial dimension 1 driven by $d$-dimensional additive space-time white noise. We establish upper and lower bounds on hitting probabilities of the solution $\{u(t, x)\}_{t \in \mathbb{R}_+, x \in [0, 1]}$, in terms of respectively Hausdorff measure and Newtonian capacity. We also obtain the Hausdorff dimensions of level sets and their projections. A result of independent interest is an anisotropic form of the Kolmogorov continuity theorem.
44 pages; submitted for publication