Abstract
We develop a higher regularity theory for general quasilinear elliptic equations and systems in divergence form with random coefficients. The main result is a large-scale L ∞-type estimate for the gradient of a solution. The estimate is proved with optimal stochastic integrability under a one-parameter family of mixing assumptions, allowing for very weak mixing with non-integrable correlations to very strong mixing (for example finite range of dependence). We also prove a quenched L 2 estimate for the error in homogenization of Dirichlet problems. The approach is based on subadditive arguments which rely on a variational formulation of general quasilinear divergence-form equations.
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Armstrong, S.N., Mourrat, JC. Lipschitz Regularity for Elliptic Equations with Random Coefficients. Arch Rational Mech Anal 219, 255–348 (2016). https://doi.org/10.1007/s00205-015-0908-4
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DOI: https://doi.org/10.1007/s00205-015-0908-4