Intermediate-mass-ratio black hole binaries: Intertwining numerical and perturbative techniques

After first reviewing the gravitational wave (GW) spectral classification. we discuss the sensitivities of GW detection in space aimed at low frequency band (100 nHz–100 mHz) and middle frequency band (100 mHz–10 Hz). The science goals are to detect GWs from (i) Supermassive Black Holes; (ii) Extreme-Mass-Ratio Black Hole Inspirals; (iii) Intermediate-Mass Black Holes; (iv) Galactic Compact Binaries; (v) Stellar-Size Black Hole Binaries; and (vi) Relic GW Background. The detector proposals have arm length ranging from 100 km to 1.35×109 km (9 AU) including (a) Solar orbiting detectors and (b) Earth orbiting detectors. We discuss especially the sensitivities in the frequency band 0.1-10 μHz and the middle frequency band (0.1 Hz–10 Hz). We propose and discuss AMIGO as an Astrodynamical Middlefrequency Interferometric GW Observatory.

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The TianQin project: Current progress on science and technology

Progress of Theoretical and Experimental Physics ◽

10.1093/ptep/ptaa114 ◽

2020 ◽

Author(s):

Jianwei Mei ◽

Yan-Zheng Bai ◽

Jiahui Bao ◽

Enrico Barausse ◽

Lin Cai ◽

...

Keyword(s):

Black Hole ◽

Ecliptic Plane ◽

Mass Ratio ◽

Massive Black Hole ◽

Black Hole Binaries ◽

Compact Binaries ◽

Single Body ◽

Science Operations ◽

New Generation ◽

Research Facilities

Abstract TianQin is a planned space-based gravitational wave (GW) observatory consisting of three Earth-orbiting satellites with an orbital radius of about $10^5 \, {\rm km}$. The satellites will form an equilateral triangle constellation the plane of which is nearly perpendicular to the ecliptic plane. TianQin aims to detect GWs between $10^{-4} \, {\rm Hz}$ and $1 \, {\rm Hz}$ that can be generated by a wide variety of important astrophysical and cosmological sources, including the inspiral of Galactic ultra-compact binaries, the inspiral of stellar-mass black hole binaries, extreme mass ratio inspirals, the merger of massive black hole binaries, and possibly the energetic processes in the very early universe and exotic sources such as cosmic strings. In order to start science operations around 2035, a roadmap called the 0123 plan is being used to bring the key technologies of TianQin to maturity, supported by the construction of a series of research facilities on the ground. Two major projects of the 0123 plan are being carried out. In this process, the team has created a new-generation $17 \, {\rm cm}$ single-body hollow corner-cube retro-reflector which was launched with the QueQiao satellite on 21 May 2018; a new laser-ranging station equipped with a $1.2 \, {\rm m}$ telescope has been constructed and the station has successfully ranged to all five retro-reflectors on the Moon; and the TianQin-1 experimental satellite was launched on 20 December 2019—the first-round result shows that the satellite has exceeded all of its mission requirements.

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High precision source characterization of intermediate mass-ratio black hole coalescences with gravitational waves: The importance of higher order multipoles

Physical Review D ◽

10.1103/physrevd.104.084068 ◽

2021 ◽

Vol 104 (8) ◽

Author(s):

Tousif Islam ◽

Scott E. Field ◽

Carl-Johan Haster ◽

Rory Smith

Keyword(s):

Black Hole ◽

Gravitational Waves ◽

High Precision ◽

Higher Order ◽

Mass Ratio ◽

Source Characterization ◽

Intermediate Mass

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The Taiji program: A concise overview

Progress of Theoretical and Experimental Physics ◽

10.1093/ptep/ptaa083 ◽

2020 ◽

Author(s):

Ziren Luo ◽

Yan Wang ◽

Yueliang Wu ◽

Wenrui Hu ◽

Gang Jin

Keyword(s):

Black Hole ◽

Gravitational Waves ◽

Frequency Band ◽

Space Mission ◽

Mass Ratio ◽

Intermediate Mass ◽

Concise Overview

Abstract Taiji is a Chinese space mission to detect gravitational waves in the frequency band 0.1 mHz to 1.0 Hz, which aims at detecting super (intermediate) mass black hole mergers and extreme (intermediate) mass ratio in-spirals. A brief introduction of its mission overview, scientific objectives, and payload design is presented. A roadmap is also given in which the launching time is set to the 2030s.

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A ROBUST TEST OF GENERAL RELATIVITY IN SPACE

International Journal of Modern Physics D ◽

10.1142/s0218271807011401 ◽

2007 ◽

Vol 16 (12a) ◽

pp. 2319-2324 ◽

Cited By ~ 1

Author(s):

JAMES GRABER

Keyword(s):

Black Holes ◽

General Relativity ◽

Black Hole ◽

Quadrupole Moment ◽

Binary Systems ◽

High Mass ◽

Uniqueness Theorems ◽

Mass Ratio ◽

Intermediate Mass ◽

Robust Test

LISA may make it possible to test the black-hole uniqueness theorems of general relativity, also called the no-hair theorems, by Ryan's method of detecting the quadrupole moment of a black hole using high-mass-ratio inspirals. This test can be performed more robustly by observing inspirals in earlier stages, where the simplifications used in making inspiral predictions by the perturbative and post-Newtonian methods are more nearly correct. Current concepts for future missions such as DECIGO and BBO would allow even more stringent tests by this same method. Recently discovered evidence supports the existence of intermediate-mass black holes (IMBHs). Inspirals of binary systems with one IMBH and one stellar-mass black hole would fall into the frequency band of proposed maximum sensitivity for DECIGO and BBO. This would enable us to perform the Ryan test more precisely and more robustly. We explain why tests based on observations earlier in the inspiral are more robust and provide preliminary estimates of possible optimal future observations.

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