scholarly journals Testing the Kerr black hole hypothesis: Comparison between the gravitational wave and the iron line approaches

2016 ◽  
Vol 760 ◽  
pp. 254-258 ◽  
Author(s):  
Alejandro Cárdenas-Avendaño ◽  
Jiachen Jiang ◽  
Cosimo Bambi
Keyword(s):  
Black Hole ◽  
Gravitational Wave ◽  
Kerr Black Hole ◽  
Iron Line

scholarly journals Testing Gravity Theory With Extreme Mass-Ratio Inspirals: Recent Progress

Proceedings ◽  
2019 ◽  
Vol 17 (1) ◽  
pp. 11
Author(s):  
Shucheng Yang ◽  
Shuo Xin ◽  
Chen Zhang ◽  
Wenbiao Han
Keyword(s):  
Black Hole ◽  
Gravitational Wave ◽  
Recent Progress ◽  
Central Body ◽  
Low Frequency ◽  
Kerr Black Hole ◽  
Compact Object ◽  
Wave Dispersion ◽  
Gravity Theory ◽  
Mass Ratio

A compact object captured by a supermassive black hole, named as extreme-mass-ratio inspiral (EMRI), is one of the most important gravitational wave sources for low-frequency interferometers such as LISA, Taiji, and TianQin. EMRIs can be used to accurately map the space-time of the central massive body. In the present paper, we introduce our recent progress on testing gravity theory with EMRIs. We demonstrate how to constrain gravitational wave dispersion and measure the deviation of the central body from the Kerr black hole. By using binary-EMRIs, the gravitational recoil and mass loss due to merger will be measured in a higher accuracy compared with the current LIGO observations. All these potential constrains and measurements will be useful for test of the gravity theory.

scholarly journals Testing the Kerr Black Hole Hypothesis with GRS 1716-249 by Combining the Continuum Fitting and the Iron-line Methods

2022 ◽  
Vol 924 (2) ◽  
pp. 72
Author(s):  
Zuobin Zhang ◽  
Honghui Liu ◽  
Askar B. Abdikamalov ◽  
Dimitry Ayzenberg ◽  
Cosimo Bambi ◽  
...  
Keyword(s):  
Black Holes ◽  
Black Hole ◽  
State Of The Art ◽  
Kerr Black Hole ◽  
Thermal Component ◽  
Fundamental Physics ◽  
Iron Line ◽  
The Past ◽  
Black Hole Binary ◽  
The Continuum

Abstract The continuum-fitting and the iron-line methods are currently the two leading techniques for measuring the spins of accreting black holes. In the past few years, these two methods have been developed for testing fundamental physics. In the present work, we employ state-of-the-art models to test black holes through the continuum-fitting and the iron-line methods and we analyze three NuSTAR observations of the black hole binary GRS 1716-249 during its outburst in 2016–2017. In these three observations, the source was in a hard-intermediate state and the spectra show both a strong thermal component and prominent relativistic reflection features. Our analysis confirms the Kerr nature of the black hole in GRS 1716-249 and provides quite stringent constraints on possible deviations from the predictions of general relativity.

scholarly journals Amplification of gravitational wave by a Kerr black hole

2021 ◽  
Vol 103 (12) ◽  
Author(s):  
Yi Gong ◽  
Zhoujian Cao ◽  
Xian Chen
Keyword(s):  
Black Hole ◽  
Gravitational Wave ◽  
Kerr Black Hole

scholarly journals Gravitational wave echoes induced by a point mass plunging into a black hole

2020 ◽  
Vol 2020 (12) ◽  
Author(s):  
Norichika Sago ◽  
Takahiro Tanaka
Keyword(s):  
Boundary Condition ◽  
Black Hole ◽  
Gravitational Wave ◽  
Previous Analysis ◽  
Kerr Black Hole ◽  
Frequency Component ◽  
Point Mass ◽  
Linear Perturbation ◽  
Perturbation Equation ◽  
Incident Waves

Abstract Recently, the possibility of detecting gravitational wave echoes in the data stream subsequent to the binary black hole mergers observed by LIGO was suggested. Motivated by this suggestion, we presented templates of echoes based on black hole perturbations in our previous work. There, we assumed that the incident waves resulting in echoes are similar to the ones that directly escape to the asymptotic infinity. In this work, to extract more reliable information on the waveform of echoes without using the naive assumption on the incident waves, we investigate gravitational waves induced by a point mass plunging into a Kerr black hole. We solve the linear perturbation equation with the source term induced by the plunging mass under the purely outgoing boundary condition at infinity and a hypothetical reflection boundary condition near the horizon. We find that the low-frequency component below the threshold of the super-radiant instability is highly suppressed, which is consistent with the incident waveform assumed in the previous analysis. We also find that the high-frequency mode excitation is significantly larger than the one used in the previous analysis, if we adopt the perfectly reflective boundary condition independently of the frequency. When we use a simple template in which the same waveform as the direct emissions to infinity is repeated with the decreasing amplitude, the correlation between the expected signal and the template turns out to decrease very rapidly.

scholarly journals Testing the Kerr black hole hypothesis with the continuum-fitting and the iron line methods: the case of GRS 1915+105

2022 ◽  
Vol 2022 (01) ◽  
pp. 019
Author(s):  
Ashutosh Tripathi ◽  
Askar B. Abdikamalov ◽  
Dimitry Ayzenberg ◽  
Cosimo Bambi ◽  
Victoria Grinberg ◽  
...  
Keyword(s):  
Black Holes ◽  
Black Hole ◽  
Deformation Parameter ◽  
Kerr Black Hole ◽  
Stellar Mass ◽  
Kerr Metric ◽  
Iron Line ◽  
Strong Gravity ◽  
The Continuum

Abstract The continuum-fitting and the iron line methods are currently the two leading techniques for probing the strong gravity region around accreting black holes. In the present work, we test the Kerr black hole hypothesis with the stellar-mass black hole in GRS 1915+105 by analyzing five disk-dominated RXTE spectra and one reflection-dominated Suzaku spectrum. The combination of the constraints from the continuum-fitting and the iron line methods has the potential to provide more stringent tests of the Kerr metric. Our constraint on the Johannsen deformation parameter α13 is -0.15 < α13 < 0.14 at 3σ, where the Kerr metric is recovered when α13 = 0.

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