Axion cloud evaporation during inspiral of black hole binaries: The effects of backreaction and radiation
Axion cloud evaporation during inspiral of black hole binaries: The effects of backreaction and radiation
复制标题
黑洞双星吸入过程中轴子云蒸发：反反应和辐射的影响
DOI：
10.1093/ptep/ptac044
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发表时间：
2022
影响因子：
3.5
通讯作者：
Tanaka Takahiro
中科院分区：
文献类型：
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作者：
Takahashi Takuya;Omiya Hidetoshi;Tanaka Takahiro
轴子等超轻标量场可以通过超辐射不稳定性在旋转黑洞周围形成云。为了通过引力波信号和观测黑洞的质量和自旋参数来探测云的存在，考虑与黑洞双星相关的云的演化是很重要的。双星伴星潮汐扰动对轴子云的影响最早是在D. Baumann et al., Phys。Rev. D,101, 083019。在这里，我们重新审视这个问题，考虑到以下几点。首先，我们研究了高多极矩的影响。其次，我们考虑了由于云和轨道运动之间的角动量转移引起的反作用力。这种角动量传递通过几何形状的变化进一步引起超细分裂的反作用力。最后，我们计算了潮汐相互作用引起的粒子数通量至无穷大。结果表明，标量场不会被黑洞重吸收。相反，对于几乎相等质量的双星，标量粒子在吸气过程中被辐射出去蒸发，而与轨道运动的方向无关。
Ultralight scalar fields such as axions can form clouds around rotating black holes (BHs) by the superradiant instability. It is important to consider the evolution of clouds associated with BH binaries for the detectability of the presence of clouds through gravitational wave signals and observations of the mass and spin parameters of BHs. The impact on the axion cloud due to the tidal perturbation from the companion in a binary system was first studied in D. Baumann et al., Phys. Rev. D,101, 083019. Here, we re-examine this issue taking into account the following points. First, we study the influence of higher-multipole moments. Second, we consider the backreaction due to the angular momentum transfer between the cloud and the orbital motion. This angular momentum transfer further causes the backreaction to the hyperfine split through the change in geometry. Finally, we calculate the particle number flux to infinity induced by the tidal interaction. As a result, we find that the scalar field is not reabsorbed by the BH. Instead, the scalar particles are radiated away to evaporate during the inspiral, irrespective of the direction of the orbital motion, for almost equal mass binaries.