Abstract:
For the diffusion equation in the exterior of a closed set $F\subset\mathbf R^m$,
$m\geqslant 2$, with Neumann conditions on the boundary,
\begin{gather*}
2\frac{\partial u}{\partial t}=\nabla u \quad\text{in}\quad \mathbf R^m\setminus F, \quad t>0,
\\
\frac{\partial u}{\partial n}\bigg|_{\partial F}=0, \quad u\big|_{t=0}=f,
\end{gather*}
pointwise stabilization, the central limit theorem, and uniform stabilization are studied.
The basic condition on the set $F$ is formulated in terms of extension properties. Model examples of sets $F$ are indicated which are of interest from the viewpoint of mathematical physics and applied probability theory.