Gradient Estimate for Solutions to Poisson Equations in Metric Measure Spaces

Abstract

Let $(X,d)$ be a complete, pathwise connected metric measure space with locally Ahlfors $Q$-regular measure $\mu$, where $Q>1$. Suppose that $(X,d,\mu )$ supports a (local) $(1,2)$-Poincaré inequality and a suitable curvature lower bound. For the Poisson equation $\Delta u=f$ on $(X,d,\mu )$, Moser-Trudinger and Sobolev inequalities are established for the gradient of $u$. The local Hölder continuity with optimal exponent of solutions is obtained.

arXiv commentJournal of Functional Analysis, to appear