Energy-critical semi-linear shifted wave equation on the hyperbolic spaces

TL;DR

This paper studies the energy-critical semi-linear shifted wave equation on hyperbolic spaces, establishing local well-posedness, Morawetz inequalities, and scattering results for radial initial data.

Contribution

It introduces Strichartz estimates compatible with energy space data, proves a Morawetz inequality, and demonstrates scattering for radial solutions on hyperbolic spaces.

Findings

Established local well-posedness in energy space.

Proved Morawetz-type inequality for defocusing case.

Demonstrated scattering for radial solutions.

Abstract

In this paper we consider a semi-linear, energy-critical, shifted wave equation on the hyperbolic space ${\mathbb H}^n$ with $3 \leq n \leq 5$: \[ \partial_t^2 u - (\Delta_{{\mathbb H}^n} + \rho^2) u = \zeta |u|^{4/(n-2)} u, \quad (x,t)\in {\mathbb H}^n \times {\mathbb R}. \] Here $\zeta = \pm 1$ and $\rho = (n-1)/2$ are constants. We introduce a family of Strichartz estimates compatible with initial data in the energy space $H^{0,1} \times L^2 ({\mathbb H}^n)$ and then establish a local theory with these initial data. In addition, we prove a Morawetz-type inequality \[ \int_{-T_-}^{T_+} \int_{{\mathbb H}^n} \frac{\rho (\cosh |x|) |u(x,t)|^{2n/(n-2)}}{\sinh |x|} d\mu(x) dt \leq n {\mathcal E}, \] in the defocusing case $\zeta = -1$, where ${\mathcal E}$ is the energy. Moreover, if the initial data are also radial, we can prove the scattering of the corresponding solutions by combining the Morawetz-type inequality, the local theory and a pointwise estimate on radial $H^{0,1}({\mathbb H}^n)$ functions.