Ergodic and Nonergodic Anomalous Diffusion in Coupled Stochastic Processes

Details Ergodic and Nonergodic Anomalous Diffusion in Coupled Stochastic Processes Ergodic and Nonergodic Anomalous Diffusion in Coupled Stochastic Processes

2009-01-29

arxiv.org/abs/0901.4785v3

New J. Phys. 11, 083009 (2009)

Physics

Condensed Matter

Statistical Mechanics

Scientific paper

10.1088/1367-2630/11/8/083009

Inspired by problems in biochemical kinetics, we study statistical properties of an overdamped Langevin process whose friction coefficient depends on the state of a similar, unobserved process. Integrating out the latter, we derive the long time behaviour of the mean square displacement. Anomalous diffusion is found. Since the diffusion exponent can not be predicted using a simple scaling argument, anomalous scaling appears as well. We also find that the coupling can lead to ergodic or non-ergodic behaviour of the studied process. We compare our theoretical predictions with numerical simulations and find an excellent agreement. The findings caution against treating biochemical systems coupled with unobserved dynamical degrees of freedom by means of standard, diffusive Langevin descriptions.

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