Global existence for a Fritz John equation in expanding FLRW spacetimes

João L. Costa, Jesús Oliver, Flavio Rossetti

We study the family of semilinear wave equations ${\square }_{{\mathbf{g}}_p}\ddot{I}•=({\partial }_t\ddot{I}•{)}^2$, on fixed expanding FLRW spacetimes, having ${\mathbb{R}}^3$ spatial slices and undergoin…