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Magnetic field evolution in relativistic unmagnetized collisionless shocks

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arxiv 0802.3217 v2 pith:GGKDBLJT submitted 2008-02-22 astro-ph physics.plasm-phphysics.space-ph

classification astro-phphysics.plasm-phphysics.space-ph
keywords magneticrelativisticacceleratedcollisionlessenergyevolutionfieldfields
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We study relativistic unmagnetized collisionless shocks using unprecedentedly large particle-in-cell simulations of two-dimensional pair plasma. High energy particles accelerated by the shock are found to drive magnetic field evolution on a timescale >10^4 plasma times. Progressively stronger magnetic fields are generated on larger scales in a growing region around the shock. Shock-generated magnetic fields and accelerated particles carry >1% and >10% of the downstream energy flux, respectively. Our results suggest limits on the magnetization of relativistic astrophysical flows.

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  1. Ultra-long simulations of collisionless relativistic shocks in front-comoving frame: evidence for a steady state and its properties

    astro-ph.HE 2026-07 conditional novelty 7.0 of 10

    In ultra-long front-comoving PIC simulations of relativistic pair shocks, the downstream region reaches a steady state controlled only by the upstream temperature, and Fermi acceleration saturates with no power-law ta...

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