三维相对论磁重联中引导场对粒子加速的影响
Guide field effects on particle acceleration in three-dimensional relativistic magnetic reconnection
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中文总结 AI 辅助
本文通过3D和2D模拟，研究了相对论磁重联中引导场强度对粒子加速的影响，发现快速加速通道在3D中持续存在但涉及粒子比例减小，导致能谱变陡和最高洛伦兹因子降低。
中文摘要 AI 辅助
相对论磁重联是天体物理等离子体中粒子加速的关键机制。最近的3D粒子网格模拟表明，在弱引导场下，粒子可以通过逃离重联等离子体并从大尺度上游电场中获得能量，以接近最大速率加速。本文研究了当引导场变得与重联场相当时，这种快速加速通道是否持续存在。我们进行了相对论电子-正电子对等离子体重联的3D模拟，并辅以相应的2D模拟，沿重联出流方向使用开放边界以建立准稳态。我们发现，增加引导场强度会降低重联率，并使高能粒子更紧密地沿局部磁场方向排列。在3D中，快速加速通道（在2D中不存在）在所研究的全部引导场范围内持续存在，但随着引导场的增强，涉及粒子的比例逐渐减小。因此，更强的引导场产生更陡的粒子能谱和更低的最高洛伦兹因子。
英文摘要
Relativistic magnetic reconnection is a key mechanism for particle acceleration in astrophysical plasmas. Recent 3D particle-in-cell simulations have shown that, for weak guide fields, particles can be accelerated at nearly the maximal rate by escaping the reconnected plasma and gaining energy from the large-scale upstream electric field. Here, we investigate whether this fast acceleration channel persists as the guide field becomes comparable to the reconnecting field. We perform 3D simulations of relativistic pair-plasma reconnection, complemented by corresponding 2D runs, using open boundaries along the reconnection outflows to establish a quasi-steady state. We find that increasing the guide field strength reduces the reconnection rate and causes energetic particles to become more closely aligned with the local magnetic field. In 3D, the fast acceleration channel---absent in 2D---persists across the full range of guide fields investigated, but involves a progressively smaller fraction of particles as the guide field increases. Consequently, stronger guide fields produce steeper particle energy spectra and lower maximum Lorentz factors.
发表机构
- National and Kapodistrian University of Athens（雅典国立卡波蒂斯坦大学）
- Columbia University（哥伦比亚大学）
- Center for Computational Astrophysics, Flatiron Institute（平顿研究所计算天体物理中心）
- Institute of Accelerating Systems & Applications（加速系统与应用研究所）
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