Uniqueness of diffusion on domains with rough boundaries
Lehrbäck, J., & Robinson, D. (2016). Uniqueness of diffusion on domains with rough boundaries. Nonlinear Analysis: Theory, Methods & Applications, 131, 6080. doi:10.1016/j.na.2015.09.007 Retrieved from http://arxiv.org/abs/1504.00127
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Nonlinear Analysis: Theory, Methods & ApplicationsDate
2016Discipline
MatematiikkaCopyright
© 2015 Elsevier Ltd. This is an preprint version of an article whose final and definitive form has been published by Elsevier.
Let Ω be a domain in View the MathML source and View the MathML source a quadratic form on L2(Ω) with domain View the MathML source where the ckl are real symmetric L∞(Ω)functions with C(x)=(ckl(x))>0 for almost all x∈Ω. Further assume there are a,δ>0 such that View the MathML source for dΓ≤1 where dΓ is the Euclidean distance to the boundary Γ of Ω.
We assume that Γ is Ahlfors sregular and if s, the Hausdorff dimension of Γ, is larger or equal to d−1 we also assume a mild uniformity property for Ω in the neighbourhood of one z∈Γ. Then we establish that h is Markov unique, i.e. it has a unique Dirichlet form extension, if and only if δ≥1+(s−(d−1)). The result applies to forms on Lipschitz domains or on a wide class of domains with Γ a selfsimilar fractal. In particular it applies to the interior or exterior of the von Koch snowflake curve in View the MathML source or the complement of a uniformly disconnected set in View the MathML source.
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