A scaling limit of the 2D parabolic Anderson model with exclusion interaction

Abstract: We consider the (discrete) parabolic Anderson model $$\partial u(t,x)/\partial t=\Delta u(t,x) +\xi_t(x) u(t,x)$$, $t\geq 0$, $x\in \mathbb{Z}<sup>d$. Here, the $\xi$-field is $\mathbb{R}$-valued, acting as a dynamic random environment, and $\Delta$ represents the discrete Laplacian. We focus on the case where $\xi$ is given by a rescaled symmetric simple exclusion process which converges to an Ornstein--Uhlenbeck process. By scaling the Laplacian diffusively and considering the equation on a torus, we demonstrate that in dimension $d=2$, when a suitably renormalized version of the above equation is considered, the sequence of solutions converges in law. This resolves an open problem from~\cite{EH23}, where a similar result was shown in the three-dimensional case. The novel contribution in the present work is the establishment of a gradient bound on the transition probability of a fixed but arbitrary number of labelled exclusion particles.