On uniqueness for time harmonic anisotropic Maxwell's equations with piecewise regular coefficients

Details On uniqueness for time harmonic anisotropic Maxwell's equations with piecewise regular coefficients On uniqueness for time harmonic anisotropic Maxwell's equations with piecewise regular coefficients

2012-01-10

arxiv.org/abs/1201.2006v1

Mathematics

Analysis of PDEs

9 pages, 4 figures

Scientific paper

We are interested in the uniqueness of solutions to Maxwell's equations when the magnetic permeability $\mu$ and the permittivity $\varepsilon$ are symmetric positive definite matrix-valued functions in $\mathbb{R}^{3}$. We show that a unique continuation result for globally $W^{1,\infty}$ coefficients in a smooth, bounded domain, allows one to prove that the solution is unique in the case of coefficients which are piecewise $W^{1,\infty}$ with respect to a suitable countable collection of sub-domains with $C^{0}$ boundaries. Such suitable collections include any bounded finite collection. The proof relies on a general argument, not specific to Maxwell's equations. This result is then extended to the case when within these sub-domains the permeability and permittivity are only $L^\infty$ in sets of small measure.

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