Year: 2025
Type: preprint
Abstract: We investigate the overdetermined problem given by \begin{equation*} Δu=0 \text{ in } Ω,\quad \frac{\partial u}{\partialν} =σ_1 u \text{ on } \partial Ω, \quad |\nabla u|=\text{constant on } \partial Ω, \end{equation*} where $Ω$ is a connected compact Riemannian surface with smooth boundary $\partial Ω$, and $σ_1$ is the first nonzero Steklov eigenvalue of $Ω$. We prove that this overdetermined problem admits a nontrivial solution if and only if $Ω$ is $σ$-homothetic to either the flat unit disk or a flat cylinder $[-T,T]\times S^1$ for some $T\ge T_1$. This gives a complete answer to the question raised by Payne and Philippin in [Z. Angew. Math. Phys. 42(6), 864-873, 1991] for $σ=σ_1$ and arbitrary surfaces. In particular, we completely characterize compact domains in 2-dimensional space forms for which the overdetermined problem is solvable.
Source: arXiv (Cornell University)
Authors: Chen, Hang, Wu, Bohan
Subfield: Applied Mathematics
Field: Mathematics
Domain: Physical Sciences
Open Access status: green
Awards: G3521362665, G6410223710
OpenAlex ID: W7110932762
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