Serrin-Type Overdetermined Problem in $\mathbb H^n$

Abstract

In this paper, we prove the symmetry of the solution to overdetermined problem for the equation σk(D 2 u − uI) = C n in hyperbolic space. Our approach is based on establishing a RellichPohozaev type identity and using a P function. Our result generalizes the overdetermined problem for Hessian equation in Euclidean space.