Global existence for quasilinear wave equations on hyperbolic space

The main purpose of this paper is to study the global solvability for a general class of quasilinear shifted wave equations on hyperbolic spaces, for smooth initial data with small amplitude.

In contrast to the case of Euclidean spaces, when the space dimension is three, we do not need to assume structural conditions like the null conditions to ensure global existence.

To achieve this, we establish the energy and local energy estimates for perturbed wave operators on $\mathbb{R}\times \mathbb{H}^n$.

These estimates allow time-dependent metric perturbations and require only suitable smallness together with polynomial decay in the radial variable $r$.

As a byproduct, for semilinear problems with power-type nonlinearities and radial data, we also obtain global solutions with low-regularity.

In particular, we prove an analog of the radial Glassey conjecture on hyperbolic space.