Path Integrals in Hamiltonian Systems: Breakup of the Last Kolmogorov-Arnold-Moser Torus Due to Random Forces

Abstract
Transport in three-dimensional nonintegrable Hamiltonian flows is studied and the destruction of Kolmogorov-Arnold-Moser barriers in the presence of stochastic perturbations described. We extend the action principle to Hamiltonians with small noise, which provides a framework to determine universal scaling of characteristic times as a function of the noise.