论文标题
中子星对中的大振幅振荡的动力学模型
Kinetic model of large-amplitude oscillations in neutron star pair cascades
论文作者
论文摘要
在中子星极盖的极端电磁场中开发的电子轴体对级联反应被认为是这些物体中磁层等离子体的关键来源。我们使用一个简化的模型，该模型映射了量子电动力学过程，该过程管理对级联反应，以分析和数值对级联的开发进行建模，并表明电场的大振幅振荡是由所得的浆液驱动的。在这些振荡中会出现血浆不稳定，并且在不断增长的电场扰动中加速的颗粒会驱动次要对爆发，从而抑制大振幅振荡。提出了一个分析模型来描述对生产和动力学集体等离子体过程之间的这种相互作用。所有分析结果均与粒子中的模拟符合非常吻合。
Electron-positron pair cascades developed in the extreme electromagnetic fields of neutron star polar caps are considered a key source of magnetospheric plasma in these objects. We use a simplified model that maps the Quantum Electrodynamics processes governing the pair cascades to analytically and numerically model the development of the pair cascade, and show that large-amplitude oscillations of the electric field are inductively driven by the resulting plasma. A plasma instability arises in these oscillations, and particles accelerated in growing electric field perturbations can drive secondary pair bursts that damp the large-amplitude oscillations. An analytical model is proposed to describe this interplay between the pair production and kinetic collective plasma processes. All analytical results are shown to be in excellent agreement with particle-in-cell simulations.
