Hyperboloidal Similarity Coordinates and a Globally Stable Blowup Profile for Supercritical Wave Maps

We consider co-rotational wave maps from (1+3)-dimensional Minkowski space into the three-sphere. This model exhibits an explicit blowup solution, and we prove the asymptotic nonlinear stability of this solution in the whole space under small perturbations of the initial data. The key ingredient is the introduction of a novel coordinate system that allows one to track the evolution past the blowup time and almost up to the Cauchy horizon of the singularity. As a consequence, we also obtain a result on continuation beyond blowup.

Automated summary

This research explores co-rotational wave maps from (1+3)-dimensional Minkowski space into the three-sphere, demonstrating an explicit blowup solution and proving its asymptotic nonlinear stability in the entire space under small perturbations of initial data. The introduction of a novel coordinate system allows tracking the evolution beyond the blowup time and almost up to the Cauchy horizon of the singularity, resulting in a continuation beyond blowup.