Qualifying ringdown and shadow of black holes under general parametrized metrics with photon orbits

Qualifying ringdown and shadow of black holes under general parametrized metrics with photon orbits
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在带有光子轨道的一般参数化度量下限定黑洞的环衰和阴影

DOI:
10.1140/epjc/s10052-021-09445-6
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发表时间:
2021-03
影响因子:
4.4
通讯作者:
Han Wen-Biao
Han Wen-Biao
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Li Song;Abdujabbarov Ahmadjon A.;Han Wen-Biao

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光子在黑洞周围的运动决定了阴影的形状,并与受扰黑洞的振铃特性相匹配。对阴影和振铃波形的观察将揭示黑洞的本质。在本文中,我们研究了超越克尔假设的一般参数化度规中光子的运动。研究了赤道面上光子圆轨道的半径和频率,得到了变参数的拟合公式。计算了与衰荡幅度衰减率相关的李雅普诺夫指数。我们还分析了一般轴对称的全参数阴影的形状。我们的结果暗示了未来结合事件视界望远镜和引力波观测对黑洞参数的潜在约束。
The motion of photons around black holes determines the shape of shadow and match the ringdown properties of a perturbed black hole. Observations of shadows and ringdown waveforms will reveal the nature of black holes. In this paper, we study the motion of photons in a general parametrized metric beyond the Kerr hypothesis. We investigated the radius and frequency of the photon circular orbits on the equatorial plane and obtained fitted formula with varied parameters. The Lyapunov exponent which connects to the decay rate of the ringdown amplitude is also calculated. We also analyzed the shape of shadow with full parameters of the generally axisymmetric metric. Our results imply the potential constraint on black hole parameters by combining the Event Horizon Telescope and gravitational wave observations in the future.
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