Sharp estimates for the Laplacian torsional rigidity with negative Robin boundary conditions

Nunzia Gavitone, David Krejcirik, Gloria Paoli

Motivated by pioneering works of Bandle and Wagner, given a bounded Lipschitz domain $\Omega \subset {\mathbb{R}}^d$ with $d\ge 3$, we consider the Robin-Laplacian torsional rigidity $τ_α(Ω)…