Cavitation instability in unmagnetized relativistic pair shocks
High Energy Astrophysical Phenomena
2026-01-07 v1
Abstract
We investigate the formation of plasma cavities in unmagnetized relativistic pair shocks and demonstrate that these cavities emerge naturally as a nonlinear consequence of asymmetric Weibel instability. We provide an intuitive physical picture and a minimal fluid model that captures the essential features of this cavitation instability and compare them with PIC results. This mechanism may provide the missing link between kinetic Weibel turbulence and macroscopic magnetic fields in astrophysical shocks.
Cite
@article{arxiv.2511.00742,
title = {Cavitation instability in unmagnetized relativistic pair shocks},
author = {Ivan Demidov and Yuri Lyubarsky and Uri Keshet},
journal= {arXiv preprint arXiv:2511.00742},
year = {2026}
}