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 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: 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 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 Black holes lessons from multipole ratios

2021 ◽  
Vol 2021 (3) ◽  
Author(s):  
Iosif Bena ◽  
Daniel R. Mayerson
Keyword(s):  
Black Holes ◽  
Black Hole ◽  
Angular Momentum ◽  
String Theory ◽  
Gravitational Wave ◽  
Scaling Limit ◽  
Kerr Black Hole ◽  
Kerr Geometry ◽  
Dimensional Black Hole ◽  
Infinite Set

Abstract We explain in detail how to calculate the gravitational mass and angular momentum multipoles of the most general non-extremal four-dimensional black hole with four magnetic and four electric charges. We also calculate these multipoles for generic supersymmetric four-dimensional microstate geometries and multi-center solutions. Both for Kerr black holes and BPS black holes many of these multipoles vanish. However, if one embeds these black holes in String Theory and slightly deforms them, one can calculate an infinite set of ratios of vanishing multipoles which remain finite as the deformation is taken away, and whose values are independent of the direction of deformation. For supersymmetric black holes, we can also compute these ratios by taking the scaling limit of multi-center solutions, and for certain black holes the ratios computed using the two methods agree spectacularly. For the Kerr black hole, these ratios pose strong constraints on the parameterization of possible deviations away from the Kerr geometry that should be tested by future gravitational wave interferometers.

scholarly journals Spinning test body orbiting around a Kerr black hole: Circular dynamics and gravitational-wave fluxes

2017 ◽  
Vol 96 (6) ◽  
Author(s):  
Georgios Lukes-Gerakopoulos ◽  
Enno Harms ◽  
Sebastiano Bernuzzi ◽  
Alessandro Nagar
Keyword(s):  
Black Hole ◽  
Gravitational Wave ◽  
Kerr Black Hole ◽  
Test Body
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