Pogorelov type interior $C^2$ estimate for sum Hessian quotient equations on Riemannian manifolds

Abstract

In this paper, we mainly study the interior $C^{2}$ estimates for a class of sum Hessian quotient equations on Riemannian manifolds. For $0\leq l<k< n$, we establish interior $C^{2}$ estimates at the center of a geodesic ball. Let $Ω$ be a bounded domain (with smooth boundary) on Riemannian manifold. For $0\leq l<k\leq n$, we establish Pogorelov type estimates on $Ω$ with the vanishing Dirichlet boundary condition.