Some Sphere Theorems in Linear Potential Theory

In this paper we analyze the capacitary potential due to a charged body in order to deduce sharp analytic and geometric inequalities, whose equality cases are saturated by domains with spherical symmetry. In particular, for a regular bounded domain $Ω\subset \mathbb{R}^n$, $n\geq 3$, we prove that if the mean curvature $H$ of the boundary obeys the condition $- \bigg[ \frac{1}{\text{Cap}(Ω)} \bigg]^{\frac{1}{n-2}} \leq \frac{H}{n-1} \leq \bigg[ \frac{1}{\text{Cap}(Ω)} \bigg]^{\frac{1}{n-2}} ,$ then $Ω$ is a round ball.

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