Noise-induced transition from anomalous to ordinary diffusion: The crossover time as a function of noise intensity

Noise-induced transition from anomalous to ordinary diffusion: The crossover time as a function of noise intensity

Date: December 1995
Creator: Floriani, Elena; Grigolini, Paolo & Mannella, Riccardo
Description: This article discusses noise-induced transition from anomalous to ordinary diffusion and the crossover time as a function of noise intensity.
Contributing Partner: UNT College of Arts and Sciences
Dynamic Approach to the Thermodynamics of Superdiffusion

Dynamic Approach to the Thermodynamics of Superdiffusion

Date: April 26, 1999
Creator: Buiatti, Marco, 1972-; Grigolini, Paolo & Montagnini, Anna
Description: This article discusses dynamic approach to the thermodynamics of superdiffusion.
Contributing Partner: UNT College of Arts and Sciences
Deterministic Brownian Motion

Deterministic Brownian Motion

Date: August 1993
Creator: Trefán, György
Description: The goal of this thesis is to contribute to the ambitious program of the foundation of developing statistical physics using chaos. We build a deterministic model of Brownian motion and provide a microscpoic derivation of the Fokker-Planck equation. Since the Brownian motion of a particle is the result of the competing processes of diffusion and dissipation, we create a model where both diffusion and dissipation originate from the same deterministic mechanism - the deterministic interaction of that particle with its environment. We show that standard diffusion which is the basis of the Fokker-Planck equation rests on the Central Limit Theorem, and, consequently, on the possibility of deriving it from a deterministic process with a quickly decaying correlation function. The sensitive dependence on initial conditions, one of the defining properties of chaos insures this rapid decay. We carefully address the problem of deriving dissipation from the interaction of a particle with a fully deterministic nonlinear bath, that we term the booster. We show that the solution of this problem essentially rests on the linear response of a booster to an external perturbation. This raises a long-standing problem concerned with Kubo's Linear Response Theory and the strong criticism against it by van ...
Contributing Partner: UNT Libraries
The Markov approximation revisited: inconsistency of the standard quantum Brownian motion model

The Markov approximation revisited: inconsistency of the standard quantum Brownian motion model

Date: February 1999
Creator: Rocco, A. (Andrea) & Grigolini, Paolo
Description: Article discussing the Markov approximation and inconsistency of the standard quantum Brownian motion model.
Contributing Partner: UNT College of Arts and Sciences