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arXiv 2111.03316gr-qcastro-ph.HEhep-th
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各向异性流体包裹下Kerr黑洞的超辐射和稳定性

Superradiance and Stability of Kerr Black Hole Enclosed by Anisotropic Fluid Matter

Mohsen Khodadi, Reza Pourkhodabakhshi

摘要:

本文以旋转的黑洞为研究对象,研究了Kiselev时空中被各向异性流体物质、辐射、尘埃和暗物质包围的大质量标量超辐射散射及其稳定性。超辐射行为依赖于Kiselev时空中各向异性物质$K$的强度参数。通过对标量扰动采用低频低质量的表现,我们发现$K<0$在较宽的频率范围内增强了超辐射散射,而$K=0$在较窄的频率范围内抑制了超辐射散射。因此,旋转黑洞周围的辐射和暗物质分别作为大质量标量超辐射的放大器和衰减器。这是因为灰尘具有双重作用,因为它承认了$K$的两个迹象。通过对BH爆机制的稳定性分析,我们发现在暗物质的存在下,标准Kerr BH($K=0$)的不稳定区得到了改善,有利于稳定化,而辐射和尘埃对它没有影响,换句话说,考虑BH周围的暗物质流体,我们得到了一个更宽的区,允许大质量标量场动力学享受超辐射稳定性.

英文摘要:

Focusing on the rotating black hole (BH) surrounded by the anisotropic fluid matters; radiation, dust, and dark matter, we study the massive scalar superradiant scattering and the stability in the Kiselev spacetime. Superradiance behavior is dependent on the intensity parameter of the anisotropic matter $K$ in the Kiselev spacetime. By adopting the manifest of low-frequency and low-mass for the scalar perturbation, we find $K<0$ enhances the superradiance scattering within the broader frequency range, compared to $K=0$ while $K>0$ suppresses within the narrower frequency range. As a result, the radiation and dark matter around the rotating BH act as amplifier and attenuator for the massive scalar superradiance, respectively. This is while the dust has a twofold role because of admitting both signs of $K$. Through stability analysis in the light of the BH bomb mechanism, we show in the presence of dark matter, the instability regime of standard Kerr BH ($K=0$) gets improved in favor of stabilization while the radiation and dust do not affect it. In other words, by taking the dark matter fluid around BH into account, we obtain a broader regime that allows the massive scalar field dynamic to enjoy superradiant stability.

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