http://arxiv.org/abs/2101.06402
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 GW190521-like binary will be more visible by space-based detectors in the low-frequency band. In addition, the ringdown gravitational-wave signal will be more loud with the next generation (3G) of ground-based detectors in the high-frequency band, displaying a great potential of the multiband gravitational wave observations. In this paper, we explore the scientific potential of multiband observations of GW190521-like binaries with milli-Hz gravitational wave observatory: LISA, deci-Hz observatory: B-DECIGO, and (next generation of) hecto-Hz observatories: aLIGO and ET. In the case of quasicircular evolution, the triple-band observation by 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 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. It would also enable to probe the ergoregion of the remnant Kerr BH through the measurement of quasinormal modes by ET. In the case of eccentric evolution, the multiband signal-to-noise ratio by “B-DECIGO + ET” observation would be larger than 100 for a five year observation prior to coalescence, even with high final eccentricities.
H. Nakano, R. Fujita, S. Isoyama, et. al.
Tue, 19 Jan 21
55/92
Comments: 29 pages, 4 figures
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