scholarly journals Erratum: Equivalence between the ADM-Hamiltonian and the harmonic-coordinates approaches to the third post-Newtonian dynamics of compact binaries [Phys. Rev. D63, 044021 (2001)]

2002 ◽  
Vol 66 (2) ◽  
Author(s):  
Thibault Damour ◽  
Piotr Jaranowski ◽  
Gerhard Schäfer
Keyword(s):  
Harmonic Coordinates ◽  
Compact Binaries ◽  
The Third ◽  
Newtonian Dynamics

scholarly journals Virgo and Gravitational-Wave Computing in Europe

2020 ◽  
Vol 245 ◽  
pp. 07050
Author(s):  
Stefano Bagnasco
Keyword(s):  
Gravitational Wave ◽  
Current Status ◽  
Low Latency ◽  
Observational Period ◽  
Compact Binaries ◽  
The Third ◽  
Compact Binary ◽  
Continuous Waves ◽  
The Us ◽  
Wave Event

Advanced Virgo is an interferometer for the detection of gravitational waves at the European Gravitational Observatory in Italy. Along with the two Advanced LIGO interferometers in the US, Advanced Virgo is being used to collect data from astrophysical sources such as compact binary coalescences and is currently running the third observational period, collecting gravitational wave event candidates at a rate of more than once per week. Data from the interferometer are processed by running search pipelines for several expected signals, from coalescing compact binaries to continuous waves and burst events. Furthermore, detector characterisation studies are run. Some of the processing needs to be done with low latency, to be able to provide triggers for other observatories and make multi-messenger observations possible. Deep searches are run offline on external computing centres. Thus, data needs also to be reliably and promptly distributed from the EGO site to computer centres in Europe and the US for further analysis and archival storage. Two of the defining characteristics of Virgo computing are the heterogeneity of the activities and the need to interoperate with LIGO. A very wide array of analysis pipelines differing in scientific target, implementation details and running environment assumptions have to be allowed to run ubiquitously and uniformly on dedicated resources and, in perspective, on heterogeneous infrastructures. The current status, possible strategies and outlook of Virgo computing are discussed.

Periastron precession due to a Janis–Newman–Winicour wormhole in the weak field limit

2021 ◽  
pp. 2150164
Author(s):  
Weijun Li ◽  
Bo Yang ◽  
Cunliang Ma ◽  
Xia Zhou ◽  
Zhongwen Feng ◽  
...  
Keyword(s):  
Test Particle ◽  
Weak Field ◽  
Spherically Symmetric ◽  
Iterative Technique ◽  
Field Limit ◽  
Harmonic Coordinates ◽  
Scalar Charge ◽  
Weak Field Limit ◽  
Newtonian Dynamics ◽  
Orbital Precession

The precession effect of periastron for a massive test particle in the spacetime of a Janis–Newman–Winicour wormhole is studied in the weak field limit. Based on the metric of this static and spherically symmetric wormhole in harmonic coordinates, we derive the second post-Newtonian dynamics of the particle. The second-order orbital precession of periastron is then obtained via a post-Newtonian iterative technique under the Wagoner–Will–Epstein–Haugan representation. Our result is found to be consistent with the classical precession effect when the asymptotic scalar charge is dropped.

scholarly journals Relativistic equations of motion of massive bodies

2009 ◽  
Vol 5 (S261) ◽  
pp. 102-102
Author(s):  
Luc Blanchet
Keyword(s):  
Gravitational Radiation ◽  
State Of The Art ◽  
Equations Of Motion ◽  
Speed Of Light ◽  
Black Hole Binaries ◽  
Compact Binaries ◽  
The Third ◽  
Current State ◽  
Relativistic Equations ◽  
Equations Of Motions

AbstractHighly relativistic equations of motions will play a crucial role for the detection and analysis of gravitational waves emitted by inspiralling compact binaries in detectors LIGO/VIRGO on ground and LISA in space. Indeed these very relativistic systems (with orbital velocities of the order of half the speed of light in the last orbital rotations) require the application of a high-order post-Newtonian formalism in general relativity for accurate description of their motion and gravitational radiation [1]. In this contribution the current state of the art which has reached the third post-Newtonian approximation for the equations of motion [2–6] and gravitational waveform [7–9] has been described (see [10] for an exhaustive review). We have also emphasized the successful matching of the post-Newtonian templates to numerically generated predictions for the merger and ring-down in the case of black-hole binaries [11].

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