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Regularity and Neumann problems for operators with real coefficients satisfying Carleson condition (2207.10366v2)

Published 21 Jul 2022 in math.AP and math.CA

Abstract: In this paper, we continue the study of a class of second order elliptic operators of the form $\mathcal L=\mbox{div}(A\nabla\cdot)$ in a domain above a Lipschitz graph in $\mathbb Rn,$ where the coefficients of the matrix $A$ satisfy a Carleson measure condition, expressed as a condition on the oscillation on Whitney balls. For this class of operators, it is known (since 2001) that the $Lq$ Dirichlet problem is solvable for some $1 < q < \infty$. Moreover, further studies completely resolved the range of $Lq$ solvability of the Dirichlet, Regularity, Neumann problems in Lipschitz domains, when the Carleson measure norm of the oscillation is sufficiently small. We show that there exists $p_{reg}>1$ such that for all $1<p<p_{reg}$ the $L^p$ Regularity problem for the operator $\mathcal L=\mbox{div}(A\nabla\cdot)$ is solvable. Furthermore $\frac1{p_{reg}}+\frac1{q_*}=1$ where $q_*\>1$ is the number such that the $Lq$ Dirichlet problem for the adjoint operator $\mathcal L*$ is solvable for all $q>q_$. Additionally when $n=2$, there exists $p_{neum}>1$ such that for all $1<p<p_{neum}$ the $Lp$ Neumann problem for the operator $\mathcal L=\mbox{div}(A\nabla\cdot)$ is solvable. Furthermore $\frac1{p_{reg}}+\frac1{q^}=1$ where $q*>1$ is the number such that the $Lq$ Dirichlet problem for the operator $\mathcal L_1=\mbox{div}(A_1\nabla\cdot)$ with matrix $A_1=A/\det{A}$ is solvable for all $q>q*$.

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