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arXiv 0802.0951gr-qcastro-ph.HE
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电磁扰动的黑洞超辐射对圆盘的照明

Disk illumination by black hole superradiance of electromagnetic perturbations

Taichi Kobayashi, Kohei Onda, Akira Tomimatsu

摘要:

利用Kerr-Schild方法求解麦克斯韦方程组,研究了Kerr黑洞周围含时电磁扰动引起的能量输运.对于这样一个盘孔系统,它被发现,从孔的能量提取可以发生在众所周知的超辐射条件下的波频率,即使能量吸收到孔应该是相当占主导地位的地平线的极性区域附近。我们估计的效率的超辐射放大的磁盘照明。进一步计算了时均能量密度分布,明确地表明了视界附近负能区的存在,并讨论了盘上热点的可能产生。

英文摘要:

Using the Kerr-Schild formalism to solve the Einstein-Maxwell equations, we study energy transport due to time-dependent electromagnetic perturbations around a Kerr black hole, which may work as a mechanism to illuminate a disk located on the equatorial plane. For such a disk-hole system it is found that the energy extraction from the hole can occur under the well-known superradiance condition for wave frequency, even though the energy absorption into the hole should be rather dominant near the polar region of the horizon. We estimate the efficiency of the superradiant amplification of the disk illumination. Further we calculate the time-averaged energy density distribution to show explicitly the existence of a negative energy region near the horizon and to discuss the possible generation of a hot spot on the disk.

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