论文标题
来自观察到的准周期振荡的Bardeen黑洞的解密签名
Deciphering signatures of Bardeen black holes from the observed quasi-periodic oscillations
论文作者
论文摘要
在黑洞的功率光谱中观察到的准周期振荡（QPO）是背景时空的独特观察探针，因为它们可以与黑洞地平线附近轨道运动相关的时间表直接相关。在这方面，高频QPO（HFQPO）特别有趣，因为它们以可相称的对发生，最常见的比率是3：2 twin峰qpos。旨在解释这些QPO的理论模型通过给定背景时空中测试粒子的上环体运动表达了观察到的频率。在这项工作中，我们研究了来自黑洞功率谱中观察到的QPO的Bardeen时空的特征。 Bardeen黑洞正在旋转，带有磁性单极电荷的常规黑洞。这种规则的背景在理论上很有趣，因为它们可以逃避曲率奇异性，否则在一般相对论的黑洞中不可避免。我们通过比较了来自黑洞源的准周期振荡与相关理论模型的可用观察结果，并注意到与黑洞和单电路电荷的黑洞相比，通常在观察到的Kerr黑洞更受青睐。我们的分析表明，与QPO相关的观察结果不利于极高的单极电荷的黑洞。
Quasi-periodic oscillations (QPOs) observed in the power spectrum of black holes are unique observational probes to the background spacetime since they can be directly related to the timescales associated with the motion of matter orbiting in the vicinity of the black hole horizon. In this regard, the high frequency QPOs (HFQPOs) are particularly interesting as they occur in commensurable pairs, the most common ratio being the 3:2 twin peak QPOs. The theoretical models which aim to explain these QPOs express the observed frequencies in terms of the epicyclic motion of test particles in a given background spacetime. In this work we study the signatures of Bardeen spacetime from the observed QPOs in the black hole power spectrum. Bardeen black holes are rotating, regular black holes with a magnetic monopole charge. Such regular backgrounds are theoretically interesting as they can potentially evade the curvature singularity, otherwise unavoidable in general relativistic black holes. We perform a chi-square analysis by comparing the available observations of the quasi-periodic oscillations from black hole sources with the relevant theoretical models and note that the Kerr black holes in general relativity are observationally more favored compared to black holes with a monopole charge. Our analysis reveals that black holes with very high monopole charge are disfavored from QPO related observations.
