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arXiv 1502.00877math.SPmath.AP
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大参数Robin Laplacian的eigenvalue渐近性的有效哈密顿量

An effective Hamiltonian for the eigenvalue asymptotics of a Robin Laplacian with a large parameter

Konstantin Pankrashkin, Nicolas Popoff

摘要:

考虑一类光滑域$Ω\subset \mathbb{R}^ν$,$ν\ge 2$上的Laplacian算子,其中$n$为外单位正规的吸引Robin边界条件:\[ Q^Ω_αu=-Δu, \quad \dfrac{\partial u}{\partial n}=αu \text{ on } \partialΩ, \ α>0, \],并研究其特征值$E_{j}(Q^Ω_α)$的渐近性以及$α\to+\infty$的一些谱性质.对于具有紧$C^2$边界和固定$j$的域,我们证明了\[ E_{j}(Q^Ω_α)=-α^2+μ_j(α)+{\mathcal O}(\log α), \],其中$μ_j(α)$是$-Δ_{S}-(ν-1)αH$的$j^{\mbox{th}}$特征值,只要它存在,$(-Δ_{S})$和$H$分别是正的Laplace-Beltrami算子和$\partialΩ$上的平均曲率.对一类具有非紧边界的域也得到了类似的结果。特别地,我们讨论了非紧区域特征值的存在性和周期区域谱隙的存在性。我们还证明了在更强的正则性假设下,余项估计可以得到改进。有效哈密顿量$-Δ_{S}-(ν-1)αH$进入流形上的半经典薛定谔算子的框架,在各种几何假设下,我们给出了它的特征值在极限$α\to+\infty$中的渐近性质.特别是,我们描述了几种情况下,我们的渐近提供的$Q^Ω_α$的特征值之间的差距大$α$。

英文摘要:

We consider the Laplacian on a class of smooth domains $Ω\subset \mathbb{R}^ν$, $ν\ge 2$, with attractive Robin boundary conditions: \[ Q^Ω_αu=-Δu, \quad \dfrac{\partial u}{\partial n}=αu \text{ on } \partialΩ, \ α>0, \] where $n$ is the outer unit normal, and study the asymptotics of its eigenvalues $E_{j}(Q^Ω_α)$ as well as some other spectral properties for $α\to+\infty$ We work with both compact domains and non-compact ones with a suitable behavior at infinity. For domains with compact $C^2$ boundaries and fixed $j$, we show that \[ E_{j}(Q^Ω_α)=-α^2+μ_j(α)+{\mathcal O}(\log α), \] where $μ_j(α)$ is the $j^{\mbox{th}}$ eigenvalue, as soon as it exists, of $-Δ_{S}-(ν-1)αH$ with $(-Δ_{S})$ and $H$ being respectively the positive Laplace-Beltrami operator and the mean curvature on $\partialΩ$. Analogous results are obtained for a class of domains with non-compact boundaries. In particular, we discuss the existence of eigenvalues in non-compact domains and the existence of spectral gaps for periodic domains. We also show that the remainder estimate can be improved under stronger regularity assumptions. The effective Hamiltonian $-Δ_{S}-(ν-1)αH$ enters the framework of semi-classical Schrödinger operators on manifolds, and we provide the asymptotics of its eigenvalues in the limit $α\to+\infty$ under various geometrical assumptions. In particular, we describe several cases for which our asymptotics provides gaps between the eigenvalues of $Q^Ω_α$ for large $α$.

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