2008/11/24 by R. A. Treumann, Treumann, R. A.
Engineering · Physics and Astronomy · #Astrophysics (astro-ph) #FOS: Physical sciences #Fluid Dynamics and Turbulent Flows #Gamma-ray bursts and supernovae #Particle Dynamics in Fluid Flows #astro-ph
paper · pdf · doi:10.48550/arxiv.0811.3938
arxiv created 2008/11/24 · openalex publication_date 2008/11/24 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We investigate the role of the form of the spatial diffusion coefficient in shock acceleration of fast particles. Referring to non-classical diffusion and using the results of numerical (hybrid) simulations tailored for the downstream shock population in quasi-perpendicualr high-Mach number collisionless shocks to which we apply the theory, we demonstrate that the inferred diffusion coefficients are in excellent agreement with the requirements of the theory and its predictions. Diffusion in the collisionless regime turns out to be non-classical Gibbsian (Lévy flight), time-dependent though weak.