PLASMA-WAVE GENERATION IN A DYNAMIC SPACETIME

PLASMA-WAVE GENERATION IN A DYNAMIC SPACETIME
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动态时空中的等离子体波生成

DOI:
10.3847/0004-637x/817/2/183
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发表时间:
2015-08
影响因子:
4.9
通讯作者:
Zhang Fan
Zhang Fan
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Yang Huan;Zhang Fan

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我们提出了一种在磁化、无力等离子体中由底层动态时空演化驱动的新的电磁发射机制。特别地,分别确定了发射出的快磁子波和阿尔夫曼波的发射功率和角分布。在磁化等离子体中发生的双黑洞合并的先前数值模拟已经记录了大量的电磁辐射,除了准直射流外,还包括一种无法解释的各向同性成分,这种成分在合并附近占主导地位。这提高了对双黑洞系统进行多信使引力波和电磁观测的可能性。本文提出的机制为数值结果提供了一种候选的分析表征,并且当与先前理解的机制(如Blandford-Znajek过程和动力学运动驱动辐射)相结合时,它允许我们构建在紧致二元聚结的启发阶段看到的不同EM辐射分量的分类。
We propose a new electromagnetic (EM)-emission mechanism in magnetized, force-free plasma, which is driven by the evolution of the underlying dynamic spacetime. In particular, the emission power and angular distribution of the emitted fast-magnetosonic and Alfvén waves are separately determined. Previous numerical simulations of binary black hole mergers occurring within magnetized plasma have recorded copious amounts of EM radiation that, in addition to collimated jets, include an unexplained, isotropic component that becomes dominant close to the merger. This raises the possibility of multimessenger gravitational-wave and EM observations on binary black hole systems. The mechanism proposed here provides a candidate analytical characterization of the numerical results, and when combined with previously understood mechanisms such as the Blandford–Znajek process and kinetic-motion-driven radiation, it allows us to construct a classification of different EM radiation components seen in the inspiral stage of compact-binary coalescences.
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