Anomalous diffusion in systems driven by the stable Levy noise with a finite noise relaxation time and inertia

Details Anomalous diffusion in systems driven by the stable Levy noise with a finite noise relaxation time and inertia Anomalous diffusion in systems driven by the stable Levy noise with a finite noise relaxation time and inertia

2011-10-21

arxiv.org/abs/1110.4755v2

Phys. Rev. E85, 021118 (2012)

Physics

Condensed Matter

Statistical Mechanics

11 pages, 6 figures

Scientific paper

10.1103/PhysRevE.85.021118

Dynamical systems driven by a general L\'evy stable noise are considered. The inertia is included and the noise, represented by a generalised Ornstein-Uhlenbeck process, has a finite relaxation time. A general linear problem (the additive noise) is solved: the resulting distribution converges with time to the distribution for the white-noise, massless case. Moreover, a multiplicative noise is discussed. It can make the distribution steeper and the variance, which is finite, depends sublinearly on time (subdiffusion). For a small mass, a white-noise limit corresponds to the Stratonovich interpretation. On the other hand, the distribution tails agree with the Ito interpretation if the inertia is very large. An escape time from the potential well is calculated.

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