Multi-Gaussian modes of diffusion in a quenched random medium

Multi-Gaussian modes of diffusion in a quenched random medium.

We have studied a model of a random walk in a quenched random environment. In addition to featuring anomalous diffusion and localization, for special regimes of disorder parameters the particle density decomposes into multi-Gaussian structure while its cumulative distribution is normal. We explain the observed fine structure of the density and point out its significance to experiments.

Autoregressive Gaussian Random Vectors of First Order

Diffusion of a polymer in a random medium

2014 The effect of a random potential on the diffusion coefficient of a polymer is shown to be a relevant perturbation in the renormalization group sense below four dimensions. Attempts to « improve » the perturbation expansion by means of the renormalization group failed as it was not possible to locate a stable accessible fixed point. Speculations on the physical implications of these results...

Quenched large deviations for multiscale diffusion processes in random environments*

We consider multiple time scales systems of stochastic differential equations with small noise in random environments. We prove a quenched large deviations principle with explicit characterization of the action functional. The random medium is assumed to be stationary and ergodic. In the course of the proof we also prove related quenched ergodic theorems for controlled diffusion processes in ra...

mesuring the staff technology readiness, the case of a multi national chemical company operating in iran

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