Kinetic simulations of the filamentation instability in pair plasmas
Kinetic simulations of the filamentation instability in pair plasmas
复制标题
对等离子体中丝状不稳定性的动力学模拟
DOI：
10.1093/mnras/stad1100
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发表时间：
2023
影响因子：
4.8
通讯作者：
Sironi, Lorenzo
中科院分区：
文献类型：
--
作者：
Iwamoto, Masanori;Sobacchi, Emanuele;Sironi, Lorenzo
电磁波和等离子体之间的非线性相互作用引起了天体物理学的极大关注，因为它可以影响快速射电暴（FRB）的传播-在射频下检测到的毫秒持续时间的发光脉冲。在FRB源附近，非线性波-等离子体相互作用的扩散不稳定性（FI）被认为是主要的，其非线性发展也可能影响FRB的色散测量。在本文中，我们进行了完全动力学粒子模拟的FI在非磁化对等离子体。我们的模拟表明，FI产生横向密度丝，和电磁波在它们之间的近真空中传播，如在波导中。密度细丝继续合并，直到波有质动力和等离子体压力梯度之间的力平衡建立。我们估计合并的时间尺度，并讨论了纤维合并FRB观测的影响。
The non-linear interaction between electromagnetic waves and plasmas attracts significant attention in astrophysics because it can affect the propagation of Fast Radio Bursts (FRBs) – luminous millisecond-duration pulses detected at radio frequency. The filamentation instability (FI) – a type of non-linear wave–plasma interaction – is considered to be dominant near FRB sources, and its non-linear development may also affect the inferred dispersion measure of FRBs. In this paper, we carry out fully kinetic particle-in-cell simulations of the FI in unmagnetized pair plasmas. Our simulations show that the FI generates transverse density filaments, and that the electromagnetic wave propagates in near vacuum between them, as in a waveguide. The density filaments keep merging until force balance between the wave ponderomotive force and the plasma pressure gradient is established. We estimate the merging time-scale and discuss the implications of filament merging for FRB observations.
基础等离子体物理
影响因子：
44.1
作者：
D. Goebel;I. Katz
通讯作者：
I. Katz