scholarly journals Accretion-driven gravitational radiation from nonrotating compact objects: Infalling quadrupolar shells

2004 ◽  
Vol 69 (12) ◽  
Author(s):  
Alessandro Nagar ◽  
Guillermo Díaz ◽  
José A. Pons ◽  
José A. Font
Keyword(s):  
Gravitational Radiation ◽  
Compact Objects

IMPULSIVE LIGHT-LIKE SIGNALS

2002 ◽  
Vol 17 (20) ◽  
pp. 2746-2746
Author(s):  
C. BARRABÈS ◽  
P. A. HOGAN
Keyword(s):  
Black Holes ◽  
Neutron Star ◽  
Neutron Stars ◽  
Gravitational Wave ◽  
Gravitational Radiation ◽  
High Speed ◽  
Compact Objects ◽  
Speed Of Light ◽  
Gravitational Fields ◽  
Multipole Source

A general characterisation of an impulsive light–like signal was given1,2. The signal may consist of a shell of null matter and/or an impulsive gravitational wave. Both parts of the signal can be unambiguously identified3,4. The signals can be used to model bursts of gravitational radiation and light– like matter accompanying cataclysmic events such as supernovae and neutron star collisions. Also in high speed collisions of compact objects such as black–holes or neutron stars the gravitational fields of these objects resemble those of impulsive light–like signals when the objects are boosted to the speed of light. Several examples of impulsive light–like signals were presented, in particular those produced by recoil effects5 and by the Aichelburg–Sexl boost of an isolated gravitating multipole source6. The detection of these signals was also discussed7.

scholarly journals GRAVITATIONAL RADIATION FROM TRIPLE STAR SYSTEMS

1999 ◽  
Vol 14 (24) ◽  
pp. 3813-3830
Author(s):  
ENRICO MONTANARI ◽  
MIRCO CALURA ◽  
PIERLUIGI FORTINI
Keyword(s):  
Gravitational Waves ◽  
Gravitational Radiation ◽  
Gravitational Interaction ◽  
Compact Objects ◽  
Perturbative Methods ◽  
New Generation ◽  
Triple Star ◽  
Far Future

We have studied the main features of the gravitational radiation generated by an astrophysical system constituting of three compact objects attracting one another (only via gravitational interaction) in such a manner that stable orbits do exist. We have limited our analysis to systems that can be treated with perturbative methods. We show the profile of the gravitational waves emitted by such systems. These results can be useful within the framework of the new gravitational astronomy which will be made feasible by means of the new generation of gravitational detectors such as LISA in a no longer far future.

Search for Gravitational Radiation of Extraterrestrial Origin

1972 ◽  
Vol 108 (11) ◽  
pp. 595 ◽  
Author(s):  
Vladimir B. Braginskii ◽  
A.B. Manukin ◽  
E.I. Popov ◽  
V.N. Rudenko ◽  
A.A. Khorev
Keyword(s):  
Gravitational Radiation ◽  
Extraterrestrial Origin

scholarly journals Spin effects in the effective field theory approach to Post-Minkowskian conservative dynamics

2021 ◽  
Vol 2021 (6) ◽  
Author(s):  
Zhengwen Liu ◽  
Rafael A. Porto ◽  
Zixin Yang
Keyword(s):  
Field Theory ◽  
Effective Field Theory ◽  
Scattering Problem ◽  
Finite Size ◽  
Effective Field ◽  
Compact Objects ◽  
Scattering Data ◽  
Theory Approach ◽  
Spin Effects ◽  
Radial Action

Abstract Building upon the worldline effective field theory (EFT) formalism for spinning bodies developed for the Post-Newtonian regime, we generalize the EFT approach to Post-Minkowskian (PM) dynamics to include rotational degrees of freedom in a manifestly covariant framework. We introduce a systematic procedure to compute the total change in momentum and spin in the gravitational scattering of compact objects. For the special case of spins aligned with the orbital angular momentum, we show how to construct the radial action for elliptic-like orbits using the Boundary-to-Bound correspondence. As a paradigmatic example, we solve the scattering problem to next-to-leading PM order with linear and bilinear spin effects and arbitrary initial conditions, incorporating for the first time finite-size corrections. We obtain the aligned-spin radial action from the resulting scattering data, and derive the periastron advance and binding energy for circular orbits. We also provide the (square of the) center-of-mass momentum to $$ \mathcal{O}\left({G}^2\right) $$ O G 2 , which may be used to reconstruct a Hamiltonian. Our results are in perfect agreement with the existent literature, while at the same time extend the knowledge of the PM dynamics of compact binaries at quadratic order in spins.

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