Porous media equations with nonlinear gradient noise and Dirichlet boundary conditions

Abstract: We establish pathwise existence of solutions for porous media and fast diffusion equations with nonlinear gradient noise, in the full regime $m\in(0,\infty)$ and for any initial data in $L^2$. Moreover, if the initial data is positive, solutions are pathwise unique. In turn, the solution map of these equations is a continuous function of the driving noise and it generates an associated random dynamical system. Finally, in the regime $m\in{1}\cup(2,\infty)$, all the aforementioned results also hold for signed initial data.