Sharp non-uniqueness of weak solutions to the semilinear wave equation

In this paper, we establish a sharp non-uniqueness result to the semilinear wave equation \[ \partial_{tt}u-\partial_{xx} u= Θ_1(\partial_t u)^2 + Θ_2(\partial_x u)^2. \] For any $Θ_1 Θ_2 < 0$, $β<1$, we construct infinitely many weak solutions $u \in C_{t,x}^β$ with zero initial data. To our know