On explicit steady-state solutions of Fokker-Planck equations for a class of nonlinear feedback systems

We study the question of existence of steady-state probability distributions for systems perturbed by white noise. We describe a class of nonlinear feedback systems for which an explicit formula for the steady-state probability density can be found. These systems include what has been called monotemperaturic systems in earlier work, We also establish relationships between the steady-state probability densities and Liapunov functions for the corresponding deterministic systems.