Continuous time random walk and parametric subordination in fractional diffusion

Details Continuous time random walk and parametric subordination in fractional diffusion Continuous time random walk and parametric subordination in fractional diffusion

2007-01-06

arxiv.org/abs/cond-mat/0701126v3

Chaos, Solitons and Fractals, Vol. 34 (2007), pp. 89-103

Physics

Condensed Matter

Statistical Mechanics

28 pages, 18 figures. Workshop 'In Search of a Theory of Complexity'. Denton, Texas, August 2005

Scientific paper

The well-scaled transition to the diffusion limit in the framework of the theory of continuous-time random walk (CTRW)is presented starting from its representation as an infinite series that points out the subordinated character of the CTRW itself. We treat the CTRW as a combination of a random walk on the axis of physical time with a random walk in space, both walks happening in discrete operational time. In the continuum limit we obtain a generally non-Markovian diffusion process governed by a space-time fractional diffusion equation. The essential assumption is that the probabilities for waiting times and jump-widths behave asymptotically like powers with negative exponents related to the orders of the fractional derivatives. By what we call parametric subordination, applied to a combination of a Markov process with a positively oriented L\'evy process, we generate and display sample paths for some special cases.

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