Diffusive fluctuations of long-range symmetric exclusion with a slow barrier

Abstract

In this article we obtain the equilibrium fluctuations of a symmetric exclusion process in $\mathbb{Z}$ with long jumps. The transition probability of the jump from $x$ to $y$ is proportional to $|x-y{|}^{-\gamma -1}$. Here we restrict to the choice $\gamma \ge 2$ so that the system has a diffusive behavior. Moreover, when particles move between ${\mathbb{Z}}_{-}^{\ast }$ and $\mathbb{N}$, the jump rates are slowed down by a factor $\alpha n^{-\beta }$, where $\alpha >0$, $\beta \ge 0$ and $n$ is the scaling parameter. Depending on the values of $\beta$ and $\gamma$, we obtain several stochastic partial differential equations, corresponding to a heat equation without boundary conditions, or with Robin boundary conditions or Neumann boundary conditions.