Global-in-time probabilistically strong solutions to stochastic power-law equations: existence and non-uniqueness

Abstract: We are concerned with the power-law fluids driven by an additive stochastic forcing in dimension $d\geq3$. For the power index $r\in(1,\frac{3d+2}{d+2})$, we establish existence of infinitely many global-in-time probabilistically strong and analytically weak solutions in $L^p_{loc}([0,\infty);L^2)\cap C([0,\infty);W^{1,\max{1,r-1}}),p\geq1$ for every divergence free initial condition in $L^2\cap W^{1,\max{1,r-1}}$. This result in particular implies non-uniqueness in law. Our result is sharp in the three dimensional case in the sense that the solution is unique if $r\geq \frac{3d+2}{d+2}$.