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 ${\square }_{{\mathbf{g}}_p}\varphi =({\partial }_t\varphi {)}^2$, on fixed expanding FLRW spacetimes, having ${\mathbb{R}}^3$ spatial slices and undergoing…