Higher order Schrödinger equations on hyperbolic spaces

We study the following higher order Schrödinger equation on hyperbolic space $\mathbb{H}^n$: $P_m u +a(x) u = |u|^{q - 2}u,$ where $P_m$ is the $2m$ order GJMS operator, $q=\frac{2n}{n-2m}$, $a(x) \in L^{\frac{n}{2m}}(\mathbb{H}^n)$ is a nonnegative potential function. We obtain a new concentration compactness principal for higher order problems on hyperbolic spaces. Under certain integrability assumptions on $a(x)$, we obtain the existence of solutions of the Schrödinger equations.