Hearing pseudoconvexity in Lipschitz domains with holes via   $\overline\partial$
  Let $\Omega=\widetilde{\Omega}\setminus \overline{D}$ where $\widetilde{\Omega}$ is a bounded domain with connected complement in $\mathbb C^n$ (or more generally in a Stein manifold) and $D$ is relatively compact open subset of $\widetilde{\Omega}$ with connected complement in $\widetilde{\Omega}$. We obtain characterizations of pseudoconvexity of $\widetilde{\Omega}$ and $D$ through the vanishing or Hausdorff property of the Dolbeault cohomology groups on various function spaces. In particular, we show that if the boundaries of $\widetilde{\Omega}$ and $D$ are Lipschitz and $C^2$-smooth respectively, then both $\widetilde{\Omega}$ and $D$ are pseudoconvex if and only if $0$ is not in the spectrum of the $\overline\partial$-Neumann Laplacian on $(0, q)$-forms for $1\le q\le n-2$ when $n\geq 3$; or $0$ is not a limit point of the spectrum of the $\overline\partial$-Neumannn Laplacian on $(0, 1)$-forms when $n=2$. 
Siqi Fu, Christine Laurent-Thi\'ebaut and Mei-Chi Shaw
math.CV