喷流激波产生的朗缪尔turbulence中的扩散辐射
Diffusive radiation in Langmuir turbulence produced by jet shocks
摘要：
带电粒子的各向异性分布（包括双流分布）引起随机电场（以朗缪尔波、布尼曼不稳定性的形式）或随机准静态磁场（韦伯不稳定性和磁不稳定性）或两者的产生。已知这些双流不稳定性在无碰撞激波形成、激波-激波相互作用和激波诱导电磁辐射中起关键作用。本文应用广义非微扰随机辐射理论研究了相对论粒子在朗缪尔波随机电场中随机游动时产生的电磁辐射。该分析考虑了不相关的朗缪尔波对辐射粒子轨迹的累积效应，从而引起粒子的角扩散，这最终修改了相应的辐射光谱。我们表明，辐射过程考虑可能是相关的各种天体物理喷流，特别是，即时伽马射线暴光谱，包括X射线过剩和即时闪光中产生的排放。
英文摘要：
Anisotropic distributions of charged particles including two-stream distributions give rise to generation of either stochastic electric fields (in the form of Langmuir waves, Buneman instability) or random quasi-static magnetic fields (Weibel and filamentation instabilities) or both. These two-stream instabilities are known to play a key role in collisionless shock formation, shock-shock interactions, and shock-induced electromagnetic emission. This paper applies the general non-perturbative stochastic theory of radiation to study electromagnetic emission produced by relativistic particles, which random walk in the stochastic electric fields of the Langmuir waves. This analysis takes into account the cumulative effect of uncorrelated Langmuir waves on the radiating particle trajectory giving rise to angular diffusion of the particle, which eventually modifies the corresponding radiation spectra. We demonstrate that the radiative process considered is probably relevant for emission produced in various kinds of astrophysical jets, in particular, prompt gamma-ray burst spectra, including X-ray excesses and prompt optical flashes.
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