Time-fractional Caputo derivative versus other integro-differential operators in generalized Fokker-Planck and generalized Langevin equations

TL;DR

This paper compares various integro-differential operators, including Caputo, Caputo-Fabrizio, Atangana-Baleanu, and conformable derivatives, in generalized Fokker-Planck and Langevin equations to understand their effects on anomalous diffusion modeling.

Contribution

It provides a comprehensive analysis of different operators' impacts on the dynamics of generalized Fokker-Planck and Langevin equations, highlighting their suitability for physical diffusion scenarios.

Findings

Operators with exponential and Mittag-Leffler kernels are unsuitable for certain diffusion models.

Conformable and Caputo operators exhibit properties similar to scaled and fractional Brownian motion.

Differences between operators significantly affect the modeling of anomalous diffusion.

Abstract

Fractional diffusion and Fokker-Planck equations are widely used tools to describe anomalous diffusion in a large variety of complex systems. The equivalent formulations in terms of Caputo or Riemann-Liouville fractional derivatives can be derived as continuum limits of continuous time random walks and are associated with the Mittag-Leffler relaxation of Fourier modes, interpolating between a short-time stretched exponential and a long-time inverse power-law scaling. More recently, a number of other integro-differential operators have been proposed, including the Caputo-Fabrizio and Atangana-Baleanu forms. Moreover, the conformable derivative has been introduced. We here study the dynamics of the associated generalized Fokker-Planck equations from the perspective of the moments, the time averaged mean squared displacements, and the autocovariance functions. We also study generalized Langevin equations based on these generalized operators. The differences between the Fokker-Planck and Langevin equations with different integro-differential operators are discussed and compared with the dynamic behavior of established models of scaled Brownian motion and fractional Brownian motion. We demonstrate that the integro-differential operators with exponential and Mittag-Leffler kernels are not suitable to be introduced to Fokker-Planck and Langevin equations for the physically relevant diffusion scenarios discussed in our paper. The conformable and Caputo Langevin equations are unveiled to share similar properties with scaled and fractional Brownian motion, respectively.