Parameter-uniform Robin uniqueness on large dilations

Abstract

Berestycki and Graham proved large-dilation uniqueness for bounded positive solutions of \[ -Δu=f(u)\quad\hbox{in }κΩ, \qquad u+α\partial_νu=0\quad\hbox{on }\partial(κΩ),\] when $\alpha$ is fixed, and remarked that the dilation threshold should not depend on $\alpha$. We show that it does not, including at the Dirichlet and Neumann endpoints, for possibly unbounded uniformly $C^{2,\gamma }$ domains. The half-space linearizations have a common positive spectral gap over the compactified boundary parameter. The Dirichlet end requires a separate compactness argument because the Robin coefficient diverges there. After rescaling by its inverse, the equation has a harmonic half-space limit. A Liouville lemma rules out a nonzero limiting trace, and the resulting endpoint compactness, together with the half-space gap and localization, yields the uniform uniqueness statement. When $\partial \Omega \ne \varnothing$, we further obtain convergence of the spectral bottom to its half-space value with error $O({\kappa }^{-1/2})$. For bounded $C^{4,\gamma }$ domains the boundary layer also has a first mean-curvature correction, with remainder $O({\kappa }^{-1-\gamma }+{\kappa }^{-2})$ on each fixed boundary strip.

arXiv comment32 pages