Density jump as a function of the field for parallel relativistic collisionless shocks

Antoine Bret; Ramesh Narayan

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arXiv · 2506.07973

Density jump as a function of the field for parallel relativistic collisionless shocks

Antoine Bret·Ramesh Narayan

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Abstract

Collisionless shocks are frequently analyzed using the magnetohydrodynamic formalism (MHD), even though the required collisionality hypothesis is not fulfilled. In a previous work \citep{BretJPP2018}, we presented a model of collisionless shock displaying an important departure from the expected MHD behavior, in the case of a strong flow aligned magnetic field. This model was non-relativistic. Here, it is extended to the relativistic regime, considering zero upstream pressure and upstream Lorentz factor $\gg 1$. The result agrees satisfactorily with Particle-in-Cell simulations and shows a similar, and important, departure from the MHD prediction. In the strong field regime, the density jump $r$, seen in the downstream frame, behaves like $r \sim 2 + 1/\gamma_{\mathrm{up}}$ while MHD predicts 4 ($\gamma_{\mathrm{up}}$ is the Lorentz factor of the upstream measured in the downstream frame). Only pair plasmas are considered.

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Antoine Bret, Ramesh Narayan. 2025-06-09. Density jump as a function of the field for parallel relativistic collisionless shocks. https://arxiv.org/abs/2506.07973

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