On the Strong unique continuation property of a degenerate elliptic operator with Hardy type potential

Abstract

In this paper we prove strong unique continuation for the following degenerate elliptic equation \begin{equation}\label{e0} Δ_zu +|z|^2\partial_t^2u = Vu,\quad (z,t) \in \mathbb{R}^N \times \mathbb{R} \end{equation} where the potential $V$ satisfies either of the following growth assumptions \begin{align} & |V(z,t)| \leq \frac{f(ρ(z,t))}{ρ(z,t)^2},\ \text{where $f$ satisfies the Dini integrability condition as in (1.3)} \\ & \text{or when } \notag \\ & |V(z,t)| \leq C\frac{ψ(z,t)^ε}{ρ(z,t)^2},\ \text{for some $\epsilon >0$ with $\psi$ as in (2.6) and $N$ even.} \notag \end{align} This extends some of the previous results obtained in [G] for this subfamily of Baouendi-Grushin operators. As corollaries, we obtain new unique continuation properties for solutions $u$ to \[ Δ_{\mathbb{H}} u = Vu \] with certain symmetries as expressed in (1.6) where ${\Delta }_{\mathbb{H}}$ corresponds to the sub-Laplacian on the Heisenberg group ${\mathbb{H}}^n$.

Introduction thoroughly revised, few important references added