scholarly journals Gravitational waves from black hole binary inspiral and merger: The span of third post-Newtonian effective-one-body templates

2003 ◽  
Vol 67 (6) ◽  
Author(s):  
Thibault Damour ◽  
Bala R. Iyer ◽  
Piotr Jaranowski ◽  
B. S. Sathyaprakash
Keyword(s):  
Black Hole ◽  
Gravitational Waves ◽  
Black Hole Binary

scholarly journals Searching for gravitational waves via Doppler tracking by future missions to Uranus and Neptune

2021 ◽  
Vol 503 (1) ◽  
pp. L73-L79
Author(s):  
Deniz Soyuer ◽  
Lorenz Zwick ◽  
Daniel J D’Orazio ◽  
Prasenjit Saha
Keyword(s):  
Black Hole ◽  
Gravitational Waves ◽  
Low Frequency ◽  
Space Mission ◽  
Radio Link ◽  
Galaxy Mergers ◽  
Laser Interferometer Space Antenna ◽  
Order Of Magnitude ◽  
Black Hole Binary ◽  
Doppler Tracking

ABSTRACT The past year has seen numerous publications underlining the importance of a space mission to the ice giants in the upcoming decade. Proposed mission plans involve a ∼10 yr cruise time to the ice giants. This cruise time can be utilized to search for low-frequency gravitational waves (GWs) by observing the Doppler shift caused by them in the Earth–spacecraft radio link. We calculate the sensitivity of prospective ice giant missions to GWs. Then, adopting a steady-state black hole binary population, we derive a conservative estimate for the detection rate of extreme mass ratio inspirals (EMRIs), supermassive black hole (SMBH), and stellar mass binary black hole (sBBH) mergers. We link the SMBH population to the fraction of quasars fbin resulting from Galaxy mergers that pair SMBHs to a binary. For a total of 10 40-d observations during the cruise of a single spacecraft, $\mathcal {O}(f_\mathrm{bin})\sim 0.5$ detections of SMBH mergers are likely, if Allan deviation of Cassini-era noise is improved by ∼102 in the 10−5 − 10−3 Hz range. For EMRIs the number of detections lies between $\mathcal {O}(0.1) \ \mathrm{ and} \ \mathcal {O}(100)$. Furthermore, ice giant missions combined with the Laser Interferometer Space Antenna (LISA) would improve the localization by an order of magnitude compared to LISA by itself.

scholarly journals Search for gravitational waves from primordial black hole binary coalescences in the galactic halo

2005 ◽  
Vol 72 (8) ◽  
Author(s):  
B. Abbott ◽  
R. Abbott ◽  
R. Adhikari ◽  
A. Ageev ◽  
B. Allen ◽  
...  
Keyword(s):  
Black Hole ◽  
Gravitational Waves ◽  
Galactic Halo ◽  
Primordial Black Hole ◽  
Black Hole Binary

scholarly journals Black Holes in General Relativity and Beyond

Proceedings ◽  
2019 ◽  
Vol 17 (1) ◽  
pp. 1 ◽  
Author(s):  
Enrico Barausse
Keyword(s):  
Black Holes ◽  
General Relativity ◽  
Black Hole ◽  
Gravitational Waves ◽  
Physical Interpretation ◽  
Binary Systems ◽  
Compact Objects ◽  
Black Hole Binary ◽  
Remarkable Agreement

The recent detections of gravitational waves from binary systems of black holes are in remarkable agreement with the predictions of General Relativity. In this pedagogical mini-review, I go through the physics of the different phases of the evolution of black hole binary systems, providing a qualitative physical interpretation of each one of them. I also briefly describe how these phases would be modified if gravitation were described by a theory extending or deforming General Relativity, or if the binary components turned out to be more exotic compact objects than black holes.

scholarly journals Pulsars

2011 ◽  
Vol 7 (S285) ◽  
pp. 103-103
Author(s):  
Benjamin W. Stappers
Keyword(s):  
Black Hole ◽  
Neutron Stars ◽  
Gravitational Wave ◽  
Gravitational Waves ◽  
Time Scales ◽  
Binary Systems ◽  
Direct Detection ◽  
Next Generation ◽  
Arrival Times ◽  
Black Hole Binary

AbstractPulsars can be considered as the ultimate time-variable source. They show variations on time-scales ranging from nanoseconds to as long as years, and they emit over almost the entire electromagnetic spectrum. The dominant modulation is associated with the rotation period, which can vary from slighty more than a millisecond to upwards of ten seconds (if we include the magnetars). Variations on time-scales shorter than the pulse period are mostly associated with emission processes and are manifested as giant pulses, microstructure and sub-pulses (to name a few). On time-scales of a rotation to a few hundred rotations are other phenomena also associated with the emission, such as nulling, moding, drifting and intermittency.By probing these and slightly longer time-scales we find that pulsars exhibit “glitches”, which are rapid variations in spin rates. They are believed to be related to the interaction between the superfluid interior of the neutron star and the outer crust. Detailed studies of glitches can reveal much about the properties of the constituents of neutron stars—the only way to probe the physics of material at such extreme densities. Time-scales of about an hour or longer reveal that some pulsars are in binary systems, in particular the most rapidly rotating systems. Discovering and studying those binary systems provides vital clues to the evolution of massive stars, while some of the systems are also the best probes of strong-field gravity theories; the elusive pulsar-black hole binary would be the ultimate system.Pulsars are tools that allow us to probe a range of phenomena and time-scales. It is possible to measure the time of arrival of pulses from some pulsars to better than a few tens of nanoseconds over years, making them some of the most accurate clocks known. Concerning their rotation, deviations from sphericity may cause pulsars to emit gravitational waves which might then be detected by next-generation gravitational-wave detectors. Pulsars themselves can be used as the arms of a Galactic-scale gravitational-wave detector. Measuring correlated deviations in the arrival times of pulses from a number of pulsars distributed throughout the Galaxy could give rise to a direct detection of the stochastic gravitational-wave background, which is associated with the astrophysics of the early Universe—most likely from supermassive black-hole binary systems, but potentially also from cosmic strings. While they are famed for their clock-like rotational stability, some pulsars—in particular the more youthful ones—exhibit modulation in pulse arrival times, often called timing noise. It was recently demonstrated that in at least some cases this variability is deterministic and is associated with modulations in the pulsar emission properties and the spin-down rate. This breakthrough may lead to further improvements in the precision which can be achieved with pulsar timing, and enhance still further the ability to test theories of gravity directly and to make a direct detection of gravitational waves.I presented some of the history of what is known about the variations in pulsars on all these time-scales and reviewed some of the recent achievements in our understanding of the phenomena. I also highlighted how new transients associated with radio-emitting neutron stars are being discovered, and how other transient sources are being identified by the same techniques. These continued improvements have come about without new telescopes, but the next generation of very sensitive wide-field instruments will permit observational cadences which will reveal many new manifestations and will further revolutionise our understanding of this class of objects which have such high astrophysical potential.

scholarly journals Particle motion in circularly polarized vacuum pp waves

2021 ◽  
Author(s):  
Pengming Zhang ◽  
Mahmut Elbistan ◽  
Peter A Horvathy
Keyword(s):  
Black Hole ◽  
Gravitational Waves ◽  
Particle Motion ◽  
Bianchi Type ◽  
Conformal Symmetry ◽  
Periodic Waves ◽  
Particle Trapping ◽  
Circularly Polarized ◽  
Black Hole Binary ◽  
The One

Abstract Bialynicki-Birula and Charzynski argued that a gravitational wave emitted during the merger of a black hole binary may be approximated by a circularly polarized wave which may in turn trap particles [1]. In this paper we consider particle motion in a class of gravitational waves which includes, besides circularly polarized periodic waves (CPP) [2], also the one proposed by Lukash [3] to study anisotropic cosmological models. Both waves have a 7-parameter conformal symmetry which contains, in addition to the generic 5-parameter (broken) Carroll group, also a 6th isometry. The Lukash spacetime can be transformed by a conformal rescaling of time to a perturbed CPP problem. Bounded geodesics, found both analytically and numerically, arise when the Lukash wave is of Bianchi type VI. Their symmetries can also be derived from the Lukash-CPP relation. Particle trapping is discussed.

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