We obtain new local Calder'on--Zygmund estimates for elliptic equations with matrixvalued weights for linear as well as nonlinear equations. We introduce a novel log-BMO condition on the weight BbbM . In particular, we assume smallness of the logarithm of the matrix-valued weight in BMO. This allows us to include degenerate, discontinuous weights. The assumption on the smallness parameter is sharp and linear in terms of the integrability exponent of the gradient. This is a novelty even in the linear setting with nondegenerate weights compared to previously known results, where the dependency was exponential. We provide examples that show the sharpness of the estimates in terms of the log-BMO norm.

Elliptic Equations with Degenerate Weights

RAFFAELLA GIOVA;
2022

Abstract

We obtain new local Calder'on--Zygmund estimates for elliptic equations with matrixvalued weights for linear as well as nonlinear equations. We introduce a novel log-BMO condition on the weight BbbM . In particular, we assume smallness of the logarithm of the matrix-valued weight in BMO. This allows us to include degenerate, discontinuous weights. The assumption on the smallness parameter is sharp and linear in terms of the integrability exponent of the gradient. This is a novelty even in the linear setting with nondegenerate weights compared to previously known results, where the dependency was exponential. We provide examples that show the sharpness of the estimates in terms of the log-BMO norm.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11367/104876
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