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arXiv 2609.07793astro-ph.HEphysics.plasm-ph

同步辐射冷却不稳定相对论等离子体的两相结构

Two-Phase Structure of Synchrotron-Cooling-Unstable Relativistic Plasma

Agnieszka Wierzchucka, Pablo J. Bilbao, Robert J. Ewart, Dmitri A. Uzdensky, Alexander A. Schekochihin

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中文总结 AI 辅助

通过解析理论、PIC模拟和流体模拟,揭示相对论同步辐射冷却无碰撞高β对等离子体因SCI与SFHI相互作用而丝化为两相介质,并提出流体模型预测其演化与出现时间。

中文摘要 AI 辅助

利用解析理论、辐射粒子云(PIC)模拟和流体模拟,我们证明相对论性的、同步辐射冷却的、无碰撞的高β对等离子体会丝化为两相介质。这一过程通过同步辐射冷却不稳定性(SCI)与同步辐射消防软管不稳定性(SFHI)的相互作用而发生。其中一相具有高等离子体β,并充满小尺度消防软管涨落,这些涨落散射粒子并将压力各向异性钉扎在消防软管边缘水平。另一相具有低得多的β,导致消防软管模式被抑制,从而允许大的压力各向异性。我们提出了这种两相等离子体的流体模型,并用它来研究SCI和SFHI的线性和非线性演化,以及预测两相结构的出现时间。

英文摘要

Using analytic theory, radiative particle-in-cell (PIC) simulations, and fluid simulations, we show that relativistic, synchrotron-cooling, collisionless, high-$β$ pair plasmas filament into a two-phase medium. This process occurs through the interplay of the synchrotron cooling instability (SCI) with the synchrotron firehose instability (SFHI). One phase has high plasma~$β$ and is infested with small-scale firehose fluctuations, which scatter particles and pin the pressure anisotropy to the firehose-marginal level. The other phase has much lower~$β$, causing the suppression of firehose modes and thus allowing large pressure anisotropies. We propose a fluid model for this two-phase plasma, which we use to study the linear and nonlinear evolution of the SCI and SFHI, and to predict the emergence time of the two-phase structure.

发表机构

  • University of Oxford(牛津大学)
  • Merton College, Oxford(默顿学院)
  • Lady Margaret Hall, Oxford(圣玛格丽特厅)
  • Stanford University(斯坦福大学)

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