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arXiv 1009.2193gr-qcastro-ph.HE
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Kerr黑洞周围圆盘发射的电磁波的超辐射散射

Superradiant scattering of electromagnetic waves emitted from disk around Kerr black holes

Taichi Kobayashi, Akira Tomimatsu

摘要:

研究了赤道面上薄圆盘包围的Kerr黑洞周围的电磁扰动。我们的主要目的是揭示从盘表面发射的电磁波的黑洞超辐射。用出射Kerr Schild场描述圆盘辐射,用真空波场描述超辐射散射,并在视界上加入真空波场以满足入射条件。给出了圆盘表面能流的计算公式,研究了圆盘-黑洞系统的能量输运。在低频近似下,我们发现从旋转黑洞中提取的能量主要被输运回盘,并讨论了在无穷远处观测到的电磁波的能谱。

英文摘要:

We study electromagnetic perturbations around a Kerr black hole surrounded by a thin disk on the equatorial plane. Our main purpose is to reveal the black hole superradiance of electromagnetic waves emitted from the disk surface. The outgoing Kerr-Schild field is used to describe the disk emission, and the superradiant scattering is represented by a vacuum wave field which is added to satisfy the ingoing condition on the horizon. The formula to calculate the energy flux on the disk surface is presented, and the energy transport in the disk-black hole system is investigated. Within the low-frequency approximation we find that the energy extracted from the rotating black hole is mainly transported back to the disk, and the energy spectrum of electromagnetic waves observed at infinity is also discussed.

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