Nonperturbative Resummation of Divergent Time-Local Generators: Disentangling Non-Markovian Dynamics
The study investigates divergences in time-local generators from perturbative expansions of non-Markovian dynamics. It finds that these long-time divergences reveal a nonperturbative dynamical map, showing singularities arise from microscopic Hamiltonians and manifesting the Khalfin effect in the reduced dynamics. Non-Markovian memory modifies asymptotic structure without changing the exponential law governing distinguishability.