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arXiv · 2010.01064

New boundary Harnack inequalities with right hand side

Xavier Ros-Oton·Clara Torres-Latorre
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Abstract

We prove new boundary Harnack inequalities in Lipschitz domains for equations with a right hand side. Our main result applies to non-divergence form operators with bounded measurable coefficients and to divergence form operators with continuous coefficients, whereas the right hand side is in $L^q$ with $q > n$. Our approach is based on the scaling and comparison arguments of \cite{DS20}, and we show that all our assumptions are sharp. As a consequence of our results, we deduce the $\mathcal{C}^{1,\alpha}$ regularity of the free boundary in the fully nonlinear obstacle problem and the fully nonlinear thin obstacle problem.

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Xavier Ros-Oton, Clara Torres-Latorre. 2020-10-02. New boundary Harnack inequalities with right hand side. https://arxiv.org/abs/2010.01064

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