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arXiv 0803.1182astro-ph
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GRB:磁场、宇宙射线和第一原理的发射?

GRB: magnetic fields, cosmic rays, and emission from first principles?

Andrei Gruzinov

摘要:

我们描述了冷等离子体云的无碰撞碰撞中大尺度磁场产生和粒子加速的情况。这一过程的第一原理(即使用粒子)数值模拟是可能的。我们的场景基本上是3D的。我们认为,{ \it大尺度}磁场不会在二维产生,即使在无碰撞等离子体。本文对二维相对论无碰撞Kelvin-Helmholtz不稳定性产生的磁场进行了计算和数值模拟。无碰撞切向间断可能比无碰撞激波更重要,因为即使在流体极限中,当激波稳定时,切向间断仍然不稳定。

英文摘要:

We describe a scenario for large-scale magnetic field generation and particle acceleration in a collisionless collision of cold plasma clouds. A first-principle (i.e. using particles) numerical simulation of this process might be possible. Our scenario is essentially 3D. We argue that {\it large-scale} magnetic fields are not generated in 2D, even in collisionless plasma. We calculate and numerically simulate magnetic field generation by relativistic collisionless Kelvin-Helmholtz instability in 2D. Collisionless tangential discontinuity might be more important than collisionless shock, because tangential discontinuity remains unstable even in the hydro limit, when the shock stabilizes.

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