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Non-Linear Langevin and Fractional Fokker-Planck Equations for Anomalous Diffusion by Lévy Stable Processes
Johan Anderson1, Sara Moradi2, Tariq Rafiq3
1Department of Space, Earth and Environment, Chalmers University of Technology, SE-412 96 Göteborg, Sweden.
This study models anomalous diffusion using a Fractional Fokker-Planck equation with Lévy fluctuations. Results show transport coefficients increase as fractality decreases, matching experimental data.
Area of Science:
- Physics
- Mathematics
- Computational Science
Background:
- Anomalous diffusion deviates from standard Brownian motion.
- Fractional calculus offers tools to describe non-local phenomena.
- Modeling complex transport requires advanced mathematical frameworks.
Purpose of the Study:
- To numerically solve a non-linear Fractional Fokker-Planck equation.
- To estimate generalized diffusion coefficients for anomalous diffusion.
- To investigate the impact of Lévy fluctuations and fractional derivatives.
Main Methods:
- Numerical solutions of the non-linear Fractional Fokker-Planck equation.
- Incorporation of fractional velocity derivatives and Langevin dynamics.
- Analysis of distribution functions for varying degrees of Lévy stability.
Main Results:
- Obtained distribution functions as solutions to the FFP equation.
- Assessed statistical properties using generalized expectation, entropy, and modified transport coefficients.
- Observed a significant increase in the transport coefficient with decreasing fractality.
Conclusions:
- The Fractional Fokker-Planck equation effectively models anomalous diffusion with Lévy fluctuations.
- Numerical findings align with experimental observations of transport phenomena.
- Fractionality is a key parameter influencing transport properties in complex systems.
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