scholarly journals Characterizing the continuous gravitational-wave signal from boson clouds around Galactic isolated black holes

2020 ◽  
Vol 102 (6) ◽  
Author(s):  
Sylvia J. Zhu ◽  
Masha Baryakhtar ◽  
Maria Alessandra Papa ◽  
Daichi Tsuna ◽  
Norita Kawanaka ◽  
...  
Keyword(s):  
Black Holes ◽  
Gravitational Wave ◽  
Wave Signal

scholarly journals GRAVITATIONAL WAVE SIGNAL FROM ASSEMBLING THE LIGHTEST SUPERMASSIVE BLACK HOLES

2010 ◽  
Vol 713 (2) ◽  
pp. 1016-1025 ◽  
Author(s):  
Kelly Holley-Bockelmann ◽  
Miroslav Micic ◽  
Steinn Sigurdsson ◽  
Louis J. Rubbo
Keyword(s):  
Black Holes ◽  
Gravitational Wave ◽  
Supermassive Black Holes ◽  
Wave Signal

scholarly journals Phenomenological time domain model for dominant quadrupole gravitational wave signal of coalescing binary black holes

2021 ◽  
Vol 103 (12) ◽  
Author(s):  
Héctor Estellés ◽  
Antoni Ramos-Buades ◽  
Sascha Husa ◽  
Cecilio García-Quirós ◽  
Marta Colleoni ◽  
...  
Keyword(s):  
Black Holes ◽  
Gravitational Wave ◽  
Time Domain ◽  
Domain Model ◽  
Binary Black Holes ◽  
Wave Signal

Probing the quantum fuzziness of space and time with gravitational waves

2017 ◽  
Vol 26 (12) ◽  
pp. 1743005
Author(s):  
A. Kobakhidze ◽  
C. Lagger ◽  
A. Manning
Keyword(s):  
Black Holes ◽  
Gravitational Wave ◽  
Gravitational Waves ◽  
Upper Bound ◽  
Planck Scale ◽  
Wave Signal ◽  
Fundamental Structure ◽  
Space And Time ◽  
Noncommutative Spacetime

We argue that the gravitational wave signal recently observed by the LIGO detectors provides a powerful tool to probe the fundamental structure of space and time. In particular, we properly model the inspiral phase of two merging black holes in a noncommutative spacetime and extract an upper bound on the scale of such quantum fuzziness at the order of the Planck scale. This improves previous constraints by [Formula: see text] orders of magnitude.

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

Universe ◽  
2021 ◽  
Vol 7 (3) ◽  
pp. 53
Author(s):  
Hiroyuki Nakano ◽  
Ryuichi Fujita ◽  
Soichiro Isoyama ◽  
Norichika Sago
Keyword(s):  
Black Holes ◽  
Gravitational Wave ◽  
Frequency Band ◽  
Strong Field ◽  
Signal To Noise Ratio ◽  
Low Frequency ◽  
Next Generation ◽  
Estimation Errors ◽  
Tests Of General Relativity ◽  
Wave Signal

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.

Problems on the Gravitational Wave and the Repulsive Gravitation

2016 ◽  
pp. 4422-4429
Author(s):  
C. Y. Lo
Keyword(s):  
Black Holes ◽  
Gravitational Wave ◽  
Einstein Equation ◽  
Wave Solution ◽  
Dynamic Solution ◽  
Pure Mathematics ◽  
Non Linear

It is exciting that the gravitational wave has been confirmed, according to the announcement of LIGO. This would be the time to fix the Einstein equation for the gravitational wave and the nonexistence of the dynamic solution. As a first step, theorists should improve their pure mathematics on non-linear mathematics and related physical considerations beyond Einstein. Then, it is time to rectify the Einstein equation that has no gravitational wave solution which Einstein has recognized, and no dynamic solution that Einstein failed to see. A problem is that physicists in LIGO did not know their shortcomings. Also, in view of the far distance of the sources, it is very questionable that the physicists can determine they are from black holes. Moreover, since the repulsive gravitation can also generate a gravitational wave, the problem of gravitational wave is actually far more complicated than we have known. A useful feature of the gravitational wave based on repulsive gravitation is that it can be easily generated on earth. Thus this can be a new tool for communication because it can penetrate any medium.

scholarly journals Gravitational wave echoes from black holes in massive gravity

2021 ◽  
Vol 103 (2) ◽  
Author(s):  
Ruifeng Dong ◽  
Dejan Stojkovic
Keyword(s):  
Black Holes ◽  
Gravitational Wave ◽  
Massive Gravity

scholarly journals The missing link in gravitational-wave astronomy

2021 ◽  
Author(s):  
Manuel Arca Sedda ◽  
Christopher P. L. Berry ◽  
Karan Jani ◽  
Pau Amaro-Seoane ◽  
Pierre Auclair ◽  
...  
Keyword(s):  
Black Holes ◽  
Gravitational Wave ◽  
Particle Physics ◽  
Cosmic Time ◽  
Compact Object ◽  
Stellar Mass ◽  
Wave Band ◽  
Binary Black Holes ◽  
Tests Of General Relativity ◽  
Binary Neutron Star

AbstractSince 2015 the gravitational-wave observations of LIGO and Virgo have transformed our understanding of compact-object binaries. In the years to come, ground-based gravitational-wave observatories such as LIGO, Virgo, and their successors will increase in sensitivity, discovering thousands of stellar-mass binaries. In the 2030s, the space-based LISA will provide gravitational-wave observations of massive black holes binaries. Between the $\sim 10$ ∼ 10 –103 Hz band of ground-based observatories and the $\sim 10^{-4}$ ∼ 1 0 − 4 –10− 1 Hz band of LISA lies the uncharted decihertz gravitational-wave band. We propose a Decihertz Observatory to study this frequency range, and to complement observations made by other detectors. Decihertz observatories are well suited to observation of intermediate-mass ($\sim 10^{2}$ ∼ 1 0 2 –104M⊙) black holes; they will be able to detect stellar-mass binaries days to years before they merge, providing early warning of nearby binary neutron star mergers and measurements of the eccentricity of binary black holes, and they will enable new tests of general relativity and the Standard Model of particle physics. Here we summarise how a Decihertz Observatory could provide unique insights into how black holes form and evolve across cosmic time, improve prospects for both multimessenger astronomy and multiband gravitational-wave astronomy, and enable new probes of gravity, particle physics and cosmology.

scholarly journals Testing stochastic gravitational wave signals from primordial black holes with optical telescopes

2021 ◽  
Vol 814 ◽  
pp. 136097
Author(s):  
Sunao Sugiyama ◽  
Volodymyr Takhistov ◽  
Edoardo Vitagliano ◽  
Alexander Kusenko ◽  
Misao Sasaki ◽  
...  
Keyword(s):  
Black Holes ◽  
Gravitational Wave ◽  
Primordial Black Holes ◽  
Optical Telescopes
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