Gradient estimates for nonlinear elliptic equations involving the Witten Laplacian on smooth metric measure spaces and implications

Abstract

This article presents new local and global gradient estimates of Li-Yau type for positive solutions to a class of nonlinear elliptic equations on smooth metric measure spaces involving the Witten Laplacian. The estimates are derived under natural lower bounds on the associated Bakry-Émery Ricci curvature tensor and find utility in proving fairly general Harnack inequalities and Liouville-type theorems to name a few. The results here unify, extend and improve various existing results in the literature for special nonlinearities already of huge interest and applications. Some consequences are presented and discussed.

Keywords

• smooth metric measure spaces
• gradient estimates
• nonlinear elliptic equations
• witten laplacian
• harnack inequalities
• li-yau estimates
• liouville-type theorems
• 53c44
• 58j60
• 58j35
• 60j60