Weighted Lp,q-estimates for higher order elliptic and parabolic systems with BMOx coefficients on Reifenberg flat domains

Abstract

We prove weighted Lp,q-estimates for divergence type higher order elliptic and parabolic systems with irregular coefficients on Reifenberg flat domains. In particular, in the parabolic case the coefficients do not have any regularity assumptions in the time variable. As functions of the spatial variables, the leading coefficients are permitted to have small mean oscillations. The weights are in the class of Muckenhoupt weights Ap. We also prove the solvability of the systems in weighted Sobolev spaces.