Intermittency for the parabolic Anderson model on spaces with sub-Gaussian heat kernel estimates
We study the parabolic Anderson model $\partial_t u=Δu+βu\,\dot W_α$ on an unbounded Ahlfors $d_h$-regular Dirichlet metric measure space whose heat kernel satisfies two-sided sub-Gaussian estimates with walk dimension $d_w$. The noise is white in time and, in space, either white ($α=0$) or colored through the Riesz kernel of $(-Δ)^{-2α}$, where $0\le 2α<d_h/d_w<1+2α$. No recurrence is assumed. We prove existence, uniqueness and Hölder regularity of the mild Skorohod solution for bounded initial conditions. For nonzero nonnegative bounded initial conditions, the solution is positive and its moment Lyapunov exponents exist for every real $p\ge1$, independently of the spatial point and the initial condition. For $p\ge2$, these exponents have order $p\,(β^2(p-1))^{d_w/((1+2α)d_w-d_h)}$, with upper and lower bounds matching up to constants.