Anomalous diffusion for overdamped particles driven by cross-correlated white noise sources

Abstract

We study the statistical properties of overdamped particles driven by two cross-correlated multiplicative Gaussian white noises in a time-dependent environment. Using the Langevin and Fokker-Planck approaches, we derive the exact probability distribution function for the particle positions, calculate its moments and find their corresponding long-time, asymptotic behaviors. The generally anomalous diffusive regimes of the particles are classified, and their dependence on the friction coefficient and the characteristics of the noises is analyzed in detail. The asymptotic predictions are confirmed by exact solutions for two examples.

15 pages

References in corpus (3)

• Fractional Langevin equation
• A simple measure of memory for dynamical processes described by the generalized Langevin equation
• Exactly solvable nonlinear model with two multiplicative Gaussian colored noises

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