2008/03/27 by Agapitos Hatzinikitas, Jiannis K. Pachos · 1 citation
Mathematics · Physics and Astronomy · #Fractional Differential Equations Solutions #Nonlinear Differential Equations Analysis #Statistical Mechanics and Entropy #hep-th #math-ph #math.MP #msc:02.30.Gp #msc:02.30.Rz #msc:02.50.-r #msc:05.40-a
paper · pdf · doi:10.1016/j.aop.2008.06.004
published as Annals of Physics, Vol. 323, Issue 12, (2008) 3000-3019 · 22 pages, 1 figure
openalex publication_date 2008/03/27 · arxiv created 2008/04/25 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
Fox's H-function provide a unified and elegant framework to tackle several physical phenomena. We solve the space fractional diffusion equation on the real line equipped with a delta distribution initial condition and identify the corresponding H-function by studying the small x expansion of the solution. The asymptotic expansions near zero and infinity are expressed, for rational values of the index α, in terms of a finite series of generalized hypergeometric functions. In x-space, the α=1 stable law is also derived by solving the anomalous diffusion equation with an appropriately chosen infinitesimal generator for time translations. We propose a new classification scheme of stable laws according to which a stable law is now characterized by a generating probability density function. Knowing this elementary probability density function and bearing in mind the infinitely divisible property we can reconstruct the corresponding stable law. Finally, using the asymptotic behavior of H-function in terms of hypergeometric functions we can compute closed expressions for the probability density functions depending on their parameters α, β, c, τ . Known cases are then reproduced and new probability density functions are presented.