Low Frequency Asymptotics and Electro-Magneto-Statics for Time-Harmonic Maxwell's Equations in Exterior Weak Lipschitz Domains with Mixed Boundary Conditions

Abstract

We prove that the time-harmonic solutions to Maxwell's equations in a 3D exterior domain converge to a certain static solution as the frequency tends to zero. We work in weighted Sobolev spaces and construct new compactly supported replacements for Dirichlet-Neumann fields. Moreover, we even show convergence in operator norm.

keywords: low frequency asymptotics, exterior boundary value problems, Maxwell's equations, electro-magneto-statics, Hodge-Helmholtz decompositions, radiating solutions, Dirichlet-Neumann fields, cohomology groups, polynomial decay of eigensolutions