Abstract
Let \(\Omega \) be a bounded open subset with \(C^{1+\kappa }\)-boundary for some \(\kappa > 0\). Consider the Dirichlet-to-Neumann operator associated with the elliptic operator \(- \sum \partial _l ( c_{kl} \, \partial _k ) + V\), where the \(c_{kl} = c_{lk}\) are Hölder continuous and \(V \in L_\infty (\Omega )\) are real valued. We prove that the Dirichlet-to-Neumann operator generates a \(C_0\)-semigroup on the space \(C(\partial \Omega )\) which is in addition holomorphic with angle \(\frac{\pi }{2}\). We also show that the kernel of the semigroup has Poisson bounds on the complex right half-plane. As a consequence, we obtain an optimal holomorphic functional calculus and maximal regularity on \(L_p(\Gamma )\) for all \(p \in (1,\infty )\).
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Acknowledgments
This work was carried out when the second named author was visiting the University of Auckland and the first named author was visiting the University of Bordeaux. Both authors wish to thank the universities for hospitalities. The research of A.F.M. ter Elst is partly supported by the Marsden Fund Council from Government funding, administered by the Royal Society of New Zealand. The research of E.M. Ouhabaz is partly supported by the ANR project ‘Harmonic Analysis at its Boundaries’, ANR-12-BS01-0013-02.
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Elst, A.F.M.t., Ouhabaz, E.M. Analyticity of the Dirichlet-to-Neumann semigroup on continuous functions. J. Evol. Equ. 19, 21–31 (2019). https://doi.org/10.1007/s00028-018-0467-x
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DOI: https://doi.org/10.1007/s00028-018-0467-x