“…Another general approach for studying large and moderate deviation problems is the well-known weak convergence method introduced in [7,10], which is based on a variational representation for positive functionals of Brownian motion or Poisson random measure. After that, this approach has been wildly applied in various stochastic dynamical systems, see, for example, [5,9,11,17,18,19,23,27,31,42,45,47] and the references therein. In the study of moderate deviation principle (MDP), one is concerned with deviation probability of a lower order than that in large deviation principle (LDP), which actually bridges the gap between LDP and central limit theorem (CLT) (see more details in the next paragraph).…”