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arXiv 0909.2317gr-qc
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广义超辐射散射

Generalised superradiant scattering

Mauricio Richartz, Silke Weinfurtner, A. J. Penner, W. G. Unruh

摘要:

分析了超辐射产生的充分必要条件。从一个波动方程,我们研究超辐射的可能性方面的有效潜力和边界条件。特别是,我们表明,存在一个ergoregion是不够的,一个适当的边界条件,例如,只有进入群速度波在事件视界,也是至关重要的。在将我们的方案应用于超辐射的标准例子之后,我们证明了没有事件视界的引力模拟模型不一定表现出超辐射。特别是,我们表明,超辐射现象是不存在的纯旋转无粘流体的涡。我们认为,应该有一个目录的超辐射系统,可以通过集中在必要和充分条件概述如下。

英文摘要:

We analyse the necessary and sufficient conditions for the occurrence of superradiance. Starting with a wave equation we examine the possibility of superradiance in terms of an effective potential and boundary conditions. In particular, we show that the existence of an ergoregion is not sufficient; an appropriate boundary condition, e.g. only ingoing group velocity waves at an event horizon, is also crucial. After applying our scheme to the standard examples of superradiance, we show that analogue models of gravity without an event horizon do not necessarily exhibit superradiance. Particularly, we show that the superradiant phenomenon is absent in purely rotating inviscid fluids with vorticity. We argue that there should be a catalogue of superradiant systems that can be found by focusing on the necessary and sufficient conditions outlined below.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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