Derives series solution for two-zone cosmic-ray diffusion and finds local-source probability at 10 TeV rises from 0.4% to 1.7-2.2% but remains model-dependent.
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Simulations show that drift dominance over diffusion can create a knee at PeV energies if parallel diffusion becomes energy-independent above 1 TeV, though some setups fail to match observed grammage.
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On the Contribution of Local Sources to the Galactic Cosmic-Ray Spectrum: An Exact Series Solution for Two-Zone Diffusion
Derives series solution for two-zone cosmic-ray diffusion and finds local-source probability at 10 TeV rises from 0.4% to 1.7-2.2% but remains model-dependent.
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Transition from Diffusion to Drift-Dominated Cosmic Ray Transport and the Origin of the Knee
Simulations show that drift dominance over diffusion can create a knee at PeV energies if parallel diffusion becomes energy-independent above 1 TeV, though some setups fail to match observed grammage.