Heidelberg 2022 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 101: Cosmic Ray 6
T 101.1: Vortrag
Donnerstag, 24. März 2022, 16:15–16:30, T-H33
Implications of turbulence dependent diffusion on Galactic cosmic ray — •Julien Dörner1,2, Patrick Reichherzer1,2,3, Julia Becker Tjus1,2, and Horst Fichtner1,2 — 1Theoretische Physik IV, Ruhr University Bochum, Bochum, Germany — 2RAPP-Center at Ruhr University Bochum, Bochum, Germany — 3IRFU, CEA, Université Paris-Saclay, F-91191 Gif-sur-Yvette, France
The motion of Galactic cosmic rays is dominated by spatial diffusion. Therefore, in order to describe their transport, a detailed knowledge of the diffusion tensor κ is necessary. This tensor depends on the particle energy, the structure of the local background field B→, and its turbulent component b→. Recent numerical analyses of diffusion coefficients in three-dimensional, isotropic turbulence show a discrepancy between its energy scaling for intermediate turbulence levels b/B and the corresponding quasi-linear prediction.
In this talk we report about probing different models for the diffusion tensor and its dependence on energy and turbulence level. We compare the results with observations of the gradient in the cosmic-ray density and of the spectral energy behavior in the Milky Way by Fermi-LAT.