Relationship between a Non-Markovian Process and Fokker-Planck Equation

Knud Zabrocki, Steffen Trimper, Svetlana Tatur, Reinhard Mahnke

Published 2006-03-09, updated 2006-03-13Version 2

We demonstrate the equivalence of a Non--Markovian evolution equation with a linear memory--coupling and a Fokker--Planck equation (FPE). In case the feedback term offers a direct and permanent coupling of the current probability density to an initial distribution, the corresponding FPE offers a non-trivial drift term depending itself on the diffusion parameter. As the consequence the deterministic part of the underlying Langevin equation is likewise determined by the noise strength of the stochastic part. This memory induced stochastic behavior is discussed for different initial distributions. The analytical calculations are supported by numerical results.