Instantons for Dynamic Models from B to H
  Instanton analysis is applied to models B--H of critical dynamics. It is shown that the static instanton of the massless $\phi^{4}$ model determines the large-order asymptotes of the perturbation expansion of these near-equilibrium dynamic models leading to factorial growth with the order of perturbation theory. 
Juha Honkonen, M. V. Komarova, M. Yu. Nalimov