Space-Time Duality and High-Order Fractional Diffusion

TL;DR

This paper extends the concept of space-time duality in fractional diffusion equations to include higher-order exponents up to 3, revealing new models for sub-diffusion and transient anomalous diffusion with applications across various scientific fields.

Contribution

It generalizes space-time duality to fractional exponents between 1 and 3, including new stochastic interpretations and applications for modeling complex diffusion processes.

Findings

Extended space-time duality to 1<α≤3

Modeled sub-diffusion with order 2<α≤3

Developed duality for tempered fractional equations

Abstract

Super-diffusion, characterized by a spreading rate $t^{1/\alpha}$ of the probability density function $p(x,t) = t^{-1/\alpha} p \left( t^{-1/\alpha} x , 1 \right)$, where $t$ is time, may be modeled by space-fractional diffusion equations with order $1 < \alpha < 2$. Some applications in biophysics (calcium spark diffusion), image processing, and computational fluid dynamics utilize integer-order and fractional-order exponents beyond than this range ($\alpha > 2$), known as high-order diffusion, or hyperdiffusion. Recently, space-time duality, motivated by Zolotarev's duality law for stable densities, established a link between time-fractional and space-fractional diffusion for $1 < \alpha \leq 2$. This paper extends space-time duality to fractional exponents $1<\alpha \leq 3$, and several applications are presented. In particular, it will be shown that space-fractional diffusion equations with order $2<\alpha \leq 3$ model sub-diffusion and have a stochastic interpretation. A space-time duality for tempered fractional equations, which models transient anomalous diffusion, is also developed.