| Popis: |
We study the exit-time of a self-interacting diffusion from an open domain $G \subset \mathbb{R}^d$. In particular, we consider the equation $d X_t = - \left( \nabla V(X_t) + \frac{1}{t}\int_0^t\nabla F (X_t - X_s)ds \right) dt + \sigma dW_t.$ We are interested in small-noise ($\sigma \to 0$) behaviour of exit-time from the potentials' domain of attraction. In this work rather weak assumptions on potentials $V$ and $F$, and on domain $G$ are considered. In particular, we do not assume $V$ nor $F$ to be either convex or concave, which covers a wide range of self-attracting and self-avoiding stochastic processes possibly moving in a complex multi-well landscape. The Large Deviation Principle for Self-interacting diffusion with generalized initial conditions is established. The main result of the paper states that, under some assumptions on potentials $V$ and $F$, and on domain $G$, Kramers' type law for the exit-time holds. Finally, we provide a result concerning the exit-location of the diffusion. |
