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Kinetic Simulations of Cosmic-Ray-Modified Shocks II: Particle Spectra

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arxiv 2009.00007 v2 pith:RLCDTKOQ submitted 2020-08-31 astro-ph.HE physics.plasm-ph

Damiano Caprioli , Colby C. Haggerty , Pasquale Blasi This is my paper · ORCID
classification astro-ph.HEphysics.plasm-ph
keywords shockshocksspectraastrophysicalenergetickineticparticlessimulations
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Diffusive shock acceleration is a prominent mechanism for producing energetic particles in space and in astrophysical systems. Such energetic particles have long been predicted to affect the hydrodynamic structure of the shock, in turn leading to CR spectra flatter than the test-particle prediction. However, in this work along with a companion paper, C. C. Haggerty and D. Caprioli, 2020, arXiv:2008.12308 [astro-ph.HE], we use self-consistent hybrid (kinetic ions-fluid electrons) simulations to show for the first time how CR-modified shocks actually produce steeper spectra. The steepening is driven by the enhanced advection of CRs embedded in magnetic turbulence downstream of the shock, in what we call the "postcursor". These results are consistent with multi-wavelength observations of supernovae and supernova remnants and have significant phenomenological implications for space/astrophysical shocks in general.

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Cited by 3 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Deep Learning Analysis of Ions Accelerated at Shocks

    astro-ph.HE 2025-11 conditional novelty 6.0 of 10

    A convolutional neural network can predict with >90% accuracy whether an ion at a collisionless shock is injected into acceleration, using only the local magnetic field time series from its first few gyrations.

  2. Speed-dependent Threshold for Electron Injection into Diffusive Shock Acceleration

    astro-ph.HE 2025-06 conditional novelty 6.0 of 10

    Electrons enter diffusive shock acceleration once their speed exceeds the shock speed, producing nonthermal tails that start at low momenta.

  3. CRESCENDO II: Spectral cosmic rays with improved energy losses and realistic supernova seeding

    astro-ph.HE 2026-07 conditional novelty 5.0 of 10

    CRESCENDO's spectral cosmic-ray solver now includes improved energy-loss processes, non-ultra-relativistic energy/pressure integrals, and supernova-remnant template injection.

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