论文标题
保姆空间中带电的黑洞：带电标量波和共振超辐射的超级放大
Charged black holes in de Sitter space: superradiant amplification of charged scalar waves and resonant hyperradiation
论文作者
论文摘要
黑洞通常居住在高度动态的银河环境中，并且经常被吸积介质渗透。标量，电磁和重力波的不可避免的散射旋转和带电的黑洞可显着证明能量提取以及随后在紧凑型物体的旋转和电磁能的费用下散射波的扩增；一种被称为超级崇拜的现象。某些情况在于触发线性超级不稳定性的程度上极大地利用了能量提取过程。我们研究了撞击Reissner-Nordström-De保姆的单色带电标量场的超级放大黑洞，这些黑洞已知会表现出超大型不稳定的绝对准模式。我们发现，即使纳入正宇宙常数时，超高的频率范围也会降低，但相对于Reissner-NordströmSpaceTime中发生的因子的扩增因子显着升高。有趣的是，我们确认，当波的频率与准时模态稳定性相匹配时，驻留在超级式方向上的长寿命的准准共振会诱导共振峰。
Black holes typically inhabit highly dynamical galactic environments and are frequently permeated by accretion media. The inevitable scattering of scalar, electromagnetic and gravitational waves off rotating and charged black holes provides a remarkable demonstration of the energy extraction and subsequent amplification of scattered waves under the expense of the compact object's rotational and electromagnetic energy; a phenomenon known as superradiance. Certain circumstances tremendously favor the energy extraction process in such extent that linear superradiant instabilities are triggered. We examine the superradiant amplification of monochromatic charged scalar fields impinging Reissner-Nordström-de Sitter black holes which are known to exhibit superradiantly unstable quasinormal modes. We find that even though the frequency range of superradiance is reduced when a positive cosmological constant is incorporated, the amplification factors are significantly elevated with respect to those occurring in Reissner-Nordström spacetime. Intriguingly, we confirm that the long-lived quasinormal resonances that reside in the superradiant regime induce resonant peaks when the wave's frequency matches the real part of the quasinormal mode, regardless of the spacetime's modal stability.
