Echoes from Classical Black Holes

Huang, Hyat; Ou, Min-Yan; Lai, Meng-Yun; Lu, H.

doi:10.48550/arxiv.2112.14780

Cited by 3 publications

(3 citation statements)

References 35 publications

(55 reference statements)

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“…Therefore, it is of great interest to study quasinormal modes of the hairy black holes endowed with three photon spheres. Note that multiple photon spheres have recently been reported in different black hole models [80][81][82].…”

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confidence: 94%

Quasinormal Modes of Black Holes with Multiple Photon Spheres

Guo,

Wang,

et al. 2021

Preprint

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For a static and spherically symmetric black hole, a photon sphere is composed of circular null geodesics of fixed radius, and plays an important role in observing the black hole. Recently, in an Einstein-Maxwell-scalar model with a non-minimal coupling between the scalar and electromagnetic fields, a class of hairy black holes has been found to possess two unstable and one stable circular null geodesics on the equatorial plane, corresponding to three photon spheres outside the event horizon. In this paper, we study quasinormal modes of the scalar field, which are associated with these circular null geodesics, in the hairy black hole spacetime. In the eikonal regime with l *

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confidence: 94%

Quasinormal Modes of Black Holes with Multiple Photon Spheres

Guo,

Wang,

et al. 2021

Preprint

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“…With our explicit construction of superradiantly unstable QNMs, the general conditions for such QNMs and how to classify them need to be thoroughly investigated. It is also tantalizing to investigate the connections between the unstable QBS's and QNMs, and black hole echoes, which also require double-peak potentials [23].…”

Section: Discussionmentioning

confidence: 99%

Extremal Charged Black Holes and Superradiantly Unstable Quasinormal Modes

Mai,

Yang,

Lü

2022

Preprint

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It was recently shown that the extremal charged black holes in STU supergravity suffer from superradiant instability owing to the existence of the unstable (low-frequency) quasibound states associated with a charged massive scalar field. In this paper, we show numerically that for some charge configurations, these black holes can also excite the (higher-frequency) superradiantly unstable quasinormal modes. We find empirically that the unstable modes are closely related to having a volcano-shaped effective potential in the Schrödinger-like wave equation.

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“…In fact, echoes have been found in dyonic black holes with a quasi-topological electromagnetic term, which have multiple photon spheres and double-peak effective potentials [46,47]. In a black hole of massive gravity, gravitational perturbations should couple with the background metric and Stuckelberg fields, which could give echo signals in the gravitational waves [48,49].…”

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confidence: 99%

Echoes from Hairy Black Holes

Guo,

Wang,

et al. 2022

Preprint

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We study the waveforms of time signals produced by scalar perturbations in static hairy black holes, in which the perturbations can be governed by a double-peak effective potential.The inner potential peak would give rise to echoes, which provide a powerful tool to test the Kerr hypothesis. The waveforms are constructed in the time and frequency domains, and we find that the late-time waveforms are determined by the long-lived and sub-long-lived quasinormal modes, which are trapped in the potential valley and near the smaller peak, respectively. When the distance between the peaks is significantly larger than the width of the peaks, a train of decaying echo pulses is produced by the superposition of the long-lived and sub-long-lived modes. In certain cases, the echoes can vanish and then reappear. When the peaks are close enough, one detects far fewer echo signals and a following sinusoid tail, which is controlled by the long-lived or sub-long-lived mode and hence decays very slowly.

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Echoes from Classical Black Holes

Cited by 3 publications

References 35 publications

Quasinormal Modes of Black Holes with Multiple Photon Spheres

Quasinormal Modes of Black Holes with Multiple Photon Spheres

Extremal Charged Black Holes and Superradiantly Unstable Quasinormal Modes

Echoes from Hairy Black Holes

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