Abstract
Let $\Omega\subset \R^2$ be a bounded planar domain, with piecewise smooth boundary $\partial \Omega$. For $\sigma>0$, we consider the Robin boundary value problem \[ -\Delta f =\lambda f, \qquad \frac{\partial f}{\partial n} + \sigma f = 0 \mbox{ on } \partial \Omega\] where $ \frac{\partial f}{\partial n} $ is the derivative in the direction of the outward pointing normal to $\partial \Omega$. Let $0<\lambda^\sigma_0\leq \lambda^\sigma_1\leq \dots $ be the corresponding eigenvalues. The purpose of this paper is to study the Robin-Neumann gaps\[ d_n(\sigma):=\lambda_n^\sigma-\lambda_n^0 .\] For a wide class of planar domains we show that there is a limiting mean value, equal to $2\length(\partial\Omega)/\area(\Omega)\cdot \sigma$ and in the smooth case, give an upper bound of $d_n(\sigma)\leq C(\Omega ) n^{1/3}\sigma $ and a uniform lower bound. For ergodic billiards we show that along a density-one subsequence, the gaps converge to the mean value. We obtain further properties for rectangles, where we have a uniform upper bound, and for disks, where we improve the general upper bound.
| Original language | English |
|---|---|
| Journal | Communications in Mathematical Physics |
| Publication status | Accepted/In press - 8 Oct 2021 |