Gradient Estimates for Hessian Equations with Measure Data

Abstract

In this article, we establish the interior gradient estimates for $k$-Hessian equations with measure data. We use the ideas from the potential theories for the $p$-Laplacian type equations and pointwise estimates of $k$-subharmonic functions by Labutin. The interior gradient regularity is optimal for $k\geqslant3$, while for $k=2$, we prove the interior $W^{2,1+\varepsilon}$ and $C^{1,α}$ estimates for $2$-subharmonic solutions.