Paper detail

The exit problem from the neighborhood of a global attractor for heavy-tailed Lévy diffusions

We consider a finite dimensional deterministic dynamical system with a global attractor A with a unique ergodic measure P concentrated on it, which is uniformly parametrized by the mean of the trajectories in a bounded set D containing A. We perturbe this dynamical system by a multiplicative heavy tailed Lévy noise of small intensity ε>0 and solve the asymptotic first exit time and location problem from a bounded domain D around the attractor A in the limit of ε to 0. In contrast to the case of Gaussian perturbations, the exit time has the asymptotically algebraic exit rate as a function of ε, just as in the case when A is a stable fixed point. In the small noise limit, we determine the joint law of the first time and the exit location on the complement of D. As an example, we study the first exit problem from a neighbourhood of a stable limit cycle for the Van der Pol oscillator perturbed by multiplicative α-stable Lévy noise.