Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
8899746 | Journal of Mathematical Analysis and Applications | 2018 | 12 Pages |
Abstract
We consider the spectral Dirichlet-Laplacian problem on a domain which is formed from a periodic waveguide Î perturbed by non-compact, non-periodic changes of geometry. We show that the domain perturbation causes an addition to the essential spectrum, which consists of isolated points belonging to the discrete spectrum of a model problem. This model problem is posed on a domain, which is just a compact perturbation of Î . We discuss the position of the new spectral components in relation to the essential spectrum of the problem in Î .
Related Topics
Physical Sciences and Engineering
Mathematics
Analysis
Authors
Sergei A. Nazarov, Jari Taskinen,