In magnetically dominated relativistic collisionless plasmas, Alfvén and slow modes follow anisotropic Goldreich-Sridhar scaling, fast modes are isotropic with larger kinetic energy fraction, and dynamic alignment weakens near kinetic scales due to thermal fluctuations.
Cosmic-Ray Propagation: Nonlinear Diffusion Parallel and Perpendicular to Mean Magnetic Field.ApJ 2008,673, 942–953, [arXiv:astro-ph/0710.2617]
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Cosmic ray transport requires a propagator P(k,s) that encodes memory and non-diffusive behaviors rather than being reduced to a single diffusion coefficient.
Multiphase ISM simulations show PeV cosmic-ray diffusion coefficients reach 10^30 cm^2 s^-1, with perpendicular transport boosted at thermal phase boundaries while overall transport is controlled by trans-Alfvenic warm and unstable gas.
Anisotropic diffusion modeling of HAWC pulsar halo morphologies constrains mean magnetic field orientations, Alfvénic Mach numbers near 0.2, and a local coherence length of ~100 pc for Geminga and Monogem.
citing papers explorer
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Turbulence Mode Decomposition and Anisotropy in Magnetically Dominated Collisionless Plasmas
In magnetically dominated relativistic collisionless plasmas, Alfvén and slow modes follow anisotropic Goldreich-Sridhar scaling, fast modes are isotropic with larger kinetic energy fraction, and dynamic alignment weakens near kinetic scales due to thermal fluctuations.
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Beyond the Diffusion Coefficient: Propagators and Memory in Cosmic Ray Transport
Cosmic ray transport requires a propagator P(k,s) that encodes memory and non-diffusive behaviors rather than being reduced to a single diffusion coefficient.
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Diffusion of PeV Cosmic Rays in the Turbulent and Multiphase Interstellar Medium
Multiphase ISM simulations show PeV cosmic-ray diffusion coefficients reach 10^30 cm^2 s^-1, with perpendicular transport boosted at thermal phase boundaries while overall transport is controlled by trans-Alfvenic warm and unstable gas.
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Anisotropic Diffusion in Pulsar Halos: Interpreting the asymmetric morphology of Geminga and Monogem halos measured by HAWC
Anisotropic diffusion modeling of HAWC pulsar halo morphologies constrains mean magnetic field orientations, Alfvénic Mach numbers near 0.2, and a local coherence length of ~100 pc for Geminga and Monogem.