Abstract:We say that Γ, the boundary of a bounded Lipschitz domain, is locally dilation invariant if, at each x ∈ Γ, Γ is either locally C 1 or locally coincides (in some coordinate system centred at x) with a Lipschitz graph Γx such that Γx = αxΓx, for some αx ∈ (0, 1). In this paper we study, for such Γ, the essential spectrum of DΓ, the double-layer (or Neumann-Poincaré) operator of potential theory, on L 2 (Γ). We show, via localisation and Floquet-Bloch-type arguments, that this essential spectrum is the union of … Show more
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