Boundary Quasi-Orthogonality and Sharp Inclusion Bounds for Large Dirichlet Eigenvalues
Alex H. Barnett,Andrew Hassell +1 more
Reads0
Chats0
TLDR
In this paper, the distance between an arbitrary parameter and the spectrum of the Dirichlet Laplacian was shown to be at most a constant factor larger than the operator norm of any one individual term.Abstract:
We study eigenfunctions $\phi_j$ and eigenvalues $E_j$ of the Dirichlet Laplacian on a bounded domain $\Omega\subset\mathbb{R}^n$ with piecewise smooth boundary. We bound the distance between an arbitrary parameter $E>0$ and the spectrum $\{E_j\}$ in terms of the boundary $L^2$-norm of a normalized trial solution $u$ of the Helmholtz equation $(\Delta+E)u=0$. We also bound the $L^2$-norm of the error of this trial solution from an eigenfunction. Both of these results are sharp up to constants, hold for all $E$ greater than a small constant, and improve upon the best-known bounds of Moler-Payne by a factor of the wavenumber $\sqrt{E}$. One application is to the solution of eigenvalue problems at high frequency, via, for example, the method of particular solutions. In the case of planar, strictly star-shaped domains we give an inclusion bound where the constant is also sharp. We give explicit constants in the theorems, and show a numerical example where an eigenvalue around the 2500th is computed to 14 digits of relative accuracy. The proof makes use of a new quasi-orthogonality property of the boundary normal derivatives of the eigenmodes (Theorem 1.3), of interest in its own right. Namely, the operator norm of the sum of rank 1 operators $\partial_n\phi_j\langle\partial_n\phi_j,\cdot\rangle$ over all $E_j$ in a spectral window of width $\sqrt{E}$—a sum with about $E^{(n-1)/2}$ terms—is at most a constant factor (independent of $E$) larger than the operator norm of any one individual term.read more
Citations
More filters
Journal ArticleDOI
Is the Helmholtz Equation Really Sign-Indefinite?
Andrea Moiola,Euan A. Spence +1 more
TL;DR: New sign-definite formulations of the Helmholtz equation posed in either the interior of a star-shaped domain with impedance boundary conditions or the exterior of aStar-shape domain, with implications for both the analysis and the practical implementation of finite element methods are introduced.
Journal ArticleDOI
An Algorithm for the Computation of Eigenvalues, Spectral Zeta Functions and Zeta-Determinants on Hyperbolic Surfaces
Alexander Strohmaier,Ville Uski +1 more
TL;DR: In this paper, the authors present a rigorous scheme that makes it possible to compute eigenvalues of the Laplace operator on hyperbolic surfaces within a given precision, based on an adaptation of the method of particular solutions to the case of locally symmetric spaces and on explicit estimates for the approximation of eigenfunctions on hyperspheres by certain basis functions.
Journal ArticleDOI
Fast Computation of High-Frequency Dirichlet Eigenmodes via Spectral Flow of the Interior Neumann-to-Dirichlet Map
Alex H. Barnett,Andrew Hassell +1 more
TL;DR: In this paper, the authors present an algorithm for numerical computation of large eigenvalues and associated eigenfunctions of the Dirichlet Laplacian in a smooth, star-shaped domain in ℝd, d ≥ 2.
Journal ArticleDOI
An Algorithm for the Computation of Eigenvalues, Spectral Zeta Functions and Zeta-Determinants on Hyperbolic Surfaces
Alexander Strohmaier,Ville Uski +1 more
TL;DR: A rigorous scheme that makes it possible to compute eigenvalues of the Laplace operator on hyperbolic surfaces within a given precision with rigorous error estimates is presented.
Journal ArticleDOI
Imaginary time propagation code for large-scale two-dimensional eigenvalue problems in magnetic fields
TL;DR: A code for solving the single-particle, time-independent Schrodinger equation in two dimensions using the imaginary time propagation (ITP) algorithm, and it includes the most recent developments in the ITP method: the arbitrary order operator factorization and the exact inclusion of a (possibly very strong) magnetic field.
References
More filters
Book
Harmonic Analysis: Real-variable Methods, Orthogonality, and Oscillatory Integrals
Elias M. Stein,Timothy S Murphy +1 more
TL;DR: In this article, the authors introduce the Heisenberg group and describe the Maximal Operators and Maximal Averages and Oscillatory Integral Integrals of the First and Second Kind.
Book
Strongly Elliptic Systems and Boundary Integral Equations
TL;DR: In this article, the Laplace equation, the Helmholtz equation, and the Sobolev spaces of strongly elliptic systems have been studied and further properties of spherical harmonics have been discussed.
Book
Isoperimetric inequalities in mathematical physics
George Pólya,Gábor Szegő +1 more
TL;DR: Isoperimetric Inequalities in Mathematical Physics (AM-27) as mentioned in this paper is an excellent survey of the literature in this area. But it is not a complete collection.
Book
Partial Differential Equations
TL;DR: The method of power series Equations of the first order Classification of partial differential equations Cauchy's problem for equations with two independent variables The Dirichlet and Neumann problems as mentioned in this paper.
Journal ArticleDOI
The Inhomogeneous Dirichlet Problem in Lipschitz Domains
D. Jerison,Carlos E. Kenig +1 more
Related Papers (5)
Approximations and bounds for eigenvalues of elliptic operators
L. Fox,P. Henrici,Cleve B. Moler +2 more