Null controllability for a heat equation with a singular inverse-square potential involving the distance to the boundary function

Abstract

This article is devoted to the analysis of control properties for a heat equation with singular potential $\mu /{\delta }^2$, defined on a bounded $C^2$ domain $\Omega \subset {\mathbb{R}}^N$, where $\delta$ is the distance to the boundary function. More precisely, we show that for any $\mu \le 1/4$ the system is exactly null controllable using a distributed control located in any open subset of $\Omega$, while for $\mu >1/4$ there is no way of preventing the solutions of the equation from blowing-up. The result is obtained applying a new Carleman estimate.