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Article

Scope Out Multiband Gravitational-Wave Observations of GW190521-Like Binary Black Holes with Space Gravitational Wave Antenna B-DECIGO

1
Faculty of Law, Ryukoku University, Kyoto 612-8577, Japan
2
Institute of Liberal Arts, Otemon Gakuin University, Osaka567-8502, Japan
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Center for Gravitational Physics, Yukawa Institute for Theoretical Physics, Kyoto University, Kyoto 606-8502, Japan
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School of Mathematics, University of Southampton, Southampton SO17 1BJ, UK
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Department of Physics, Kyoto University, Kyoto 606-8502, Japan
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Advanced Mathematical Institute, Osaka City University, Osaka 558-8585, Japan
*
Author to whom correspondence should be addressed.
Academic Editor: Ofek Birnholtz
Universe 2021, 7(3), 53; https://doi.org/10.3390/universe7030053
Received: 16 January 2021 / Revised: 18 February 2021 / Accepted: 23 February 2021 / Published: 3 March 2021
The gravitational wave event, GW190521, is the most massive binary black hole merger observed by ground-based gravitational wave observatories LIGO/Virgo to date. While the observed gravitational wave signal is mainly in the merger and ringdown phases, the inspiral gravitational wave signal of the GW190521-like binary will be more visible to space-based detectors in the low-frequency band. In addition, the ringdown gravitational wave signal will be louder in the next generation (3G) of ground-based detectors in the high-frequency band, displaying the great potential of multiband gravitational wave observations. In this paper, we explore the scientific potential of multiband observations of GW190521-like binaries with a milli-Hz gravitational wave observatory: LISA; a deci-Hz observatory: B-DECIGO; and (next generation of) hecto-Hz observatories: aLIGO and ET. In the case of quasicircular evolution, the triple-band observations of LISA, B-DECIGO, and ET will provide parameter estimation errors of the masses and spin amplitudes of component black holes at the level of order of 1–10%. This would allow consistency tests of general relativity in the strong field at an unparalleled precision, particularly with the “B-DECIGO + ET” observation. In the case of eccentric evolution, the multiband signal-to-noise ratio found in “B-DECIGO + ET” observation would be larger than 100 for a five-year observation prior to coalescence, even with high final eccentricities. View Full-Text
Keywords: gravitational waves; binary black holes; quasinormal modes; general relativity gravitational waves; binary black holes; quasinormal modes; general relativity
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MDPI and ACS Style

Nakano, H.; Fujita, R.; Isoyama, S.; Sago, N. Scope Out Multiband Gravitational-Wave Observations of GW190521-Like Binary Black Holes with Space Gravitational Wave Antenna B-DECIGO. Universe 2021, 7, 53. https://doi.org/10.3390/universe7030053

AMA Style

Nakano H, Fujita R, Isoyama S, Sago N. Scope Out Multiband Gravitational-Wave Observations of GW190521-Like Binary Black Holes with Space Gravitational Wave Antenna B-DECIGO. Universe. 2021; 7(3):53. https://doi.org/10.3390/universe7030053

Chicago/Turabian Style

Nakano, Hiroyuki, Ryuichi Fujita, Soichiro Isoyama, and Norichika Sago. 2021. "Scope Out Multiband Gravitational-Wave Observations of GW190521-Like Binary Black Holes with Space Gravitational Wave Antenna B-DECIGO" Universe 7, no. 3: 53. https://doi.org/10.3390/universe7030053

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