Non-Markovian diffusion equations and processes: analysis and simulations
Abstract
In this paper we introduce and analyze a class of diffusion type equations related to certain non-Markovian stochastic processes. We start from the forward drift equation which is made non-local in time by the introduction of a suitable chosen memory kernel K(t). The resulting non-Markovian equation can be interpreted in a natural way as the evolution equation of the marginal density function of a random time process l(t). We then consider the subordinated process Y(t)=X(l(t)) where X(t) is a Markovian diffusion. The corresponding time evolution of the marginal density function of Y(t) is governed by a non-Markovian Fokker-Planck equation which involves the memory kernel K(t). We develop several applications and derive the exact solutions. We consider different stochastic models for the given equations providing path simulations.
Cite
@article{arxiv.0712.0240,
title = {Non-Markovian diffusion equations and processes: analysis and simulations},
author = {Antonio Mura and Murad S. Taqqu and Francesco Mainardi},
journal= {arXiv preprint arXiv:0712.0240},
year = {2009}
}
Comments
43 pages, 19 figures, in press on Physica A (2008)