scholarly journals GRAVITATIONAL WAVES FROM COALESCING BINARY SOURCES

2010 ◽  
Vol 19 (14) ◽  
pp. 2295-2298 ◽  
Author(s):  
M. D. MAIA
Keyword(s):  
Gravitational Waves ◽  
Gravitational Radiation ◽  
Theoretical Basis ◽  
Binary Systems ◽  
Translational Symmetry ◽  
Axially Symmetric ◽  
Poincaré Symmetry ◽  
Group Of Isometries ◽  
Coalescing Binary Systems ◽  
Binary Sources

Coalescing binary systems (e.g. pulsars, neutron stars and black holes) are currently considered to be the most likely sources of gravitational radiation, yet to be detected on or near Earth, where the local gravitational field is negligible and the Poincaré symmetry rules. On the other hand, the general theory of gravitational waves emitted by axially symmetric rotating sources predicts the existence of a nonvanishing news function. The existence of such function implies that, for a distant observer, the asymptotic group of isometries, the BMS group, has a translational symmetry that depends on the orbit periodicity of the source, thus breaking the isotropy of the Poincaré translations. These results suggest that the asymptotic BMS-covariant wave equation should be applied to obtain a proper theoretical basis for the gravitational waves observations from those binary sources.

scholarly journals The gravitational radiation power of the blazar OJ 287

2020 ◽  
Vol 4 (4) ◽  
pp. 397-411
Author(s):  
A. E. Volvach ◽  
◽  
L. N. Volvach ◽  
M. G. Larionov ◽  
◽  
...  
Keyword(s):  
Black Holes ◽  
Gravitational Waves ◽  
Gravitational Radiation ◽  
Binary Systems ◽  
Radiation Power ◽  
Close Binary ◽  
Frequency Monitoring ◽  
Radio Band ◽  
Harmonic Analyses ◽  
Blazar Oj 287

Using a new model based on the consideration of close binary systems (CDS) of supermassive black holes (SMBHs), we obtained data for the OJ 287 blazar, which is necessary for finding the parameters of the OJ 287 gravitational radiation. We used the results of multi-frequency monitoring performed only in the radio band. The application of harmonic analyses of observational data allowed us to construct a model of CDS consisting of two SMBHs of comparable masses, which made it possible to find the power of gravitational radiation coming from OJ 287, variations in the orbit of the double SMDS, and to consider the possibility of experimentally determining changes in these parameters in the system. Variants of radiation of electromagnetic and gravitational waves coming from OJ 287 in various states of object activity are considered.

scholarly journals Gravitational waves in massive conformal gravity

2020 ◽  
Vol 80 (7) ◽  
Author(s):  
F. F. Faria
Keyword(s):  
Plane Wave ◽  
Gravitational Waves ◽  
Gravitational Radiation ◽  
Binary Systems ◽  
Plane Waves ◽  
Graviton Mass ◽  
Conformal Gravity ◽  
Physical Plane ◽  
Field Equations ◽  
Plane Wave Solution

Abstract First, we obtain the plane wave solution of the linearized massive conformal gravity field equations. It is shown that the theory has seven physical plane waves. In addition, we investigate the gravitational radiation from binary systems in massive conformal gravity. We find that the theory with large graviton mass can reproduce the orbit of binaries by the emission of gravitational waves.

scholarly journals Standard sirens and dark sector with Gaussian process

2018 ◽  
Vol 168 ◽  
pp. 01008 ◽  
Author(s):  
Rong-Gen Cai ◽  
Tao Yang
Keyword(s):  
Monte Carlo ◽  
Gaussian Process ◽  
Gravitational Waves ◽  
Binary Systems ◽  
Cosmological Parameters ◽  
Dark Sector ◽  
Compact Binary ◽  
Compact Binary Systems ◽  
Process Methodology ◽  
The Universe

The gravitational waves from compact binary systems are viewed as a standard siren to probe the evolution of the universe. This paper summarizes the potential and ability to use the gravitational waves to constrain the cosmological parameters and the dark sector interaction in the Gaussian process methodology. After briefly introducing the method to reconstruct the dark sector interaction by the Gaussian process, the concept of standard sirens and the analysis of reconstructing the dark sector interaction with LISA are outlined. Furthermore, we estimate the constraint ability of the gravitational waves on cosmological parameters with ET. The numerical methods we use are Gaussian process and the Markov-Chain Monte-Carlo. Finally, we also forecast the improvements of the abilities to constrain the cosmological parameters with ET and LISA combined with the Planck.

scholarly journals Resampling to accelerate cross-correlation searches for continuous gravitational waves from binary systems

2018 ◽  
Vol 97 (4) ◽  
Author(s):  
Grant David Meadors ◽  
Badri Krishnan ◽  
Maria Alessandra Papa ◽  
John T. Whelan ◽  
Yuanhao Zhang
Keyword(s):  
Gravitational Waves ◽  
Binary Systems ◽  
Cross Correlation

scholarly journals Gravitons From a Spinning Rod

1978 ◽  
Vol 31 (2) ◽  
pp. 205
Author(s):  
George L Murphy
Keyword(s):  
Gravitational Waves ◽  
Gravitational Radiation

It is shown that the gravitational radiation from a spinning rod cannot be calculated c1assicaJly unless the mass of the rod exceeds several tonnes. If laboratory sources of gravitational waves ever become feasible, they will have to be described quantum mechanically, and should make possible the detection of individual gravitons.

scholarly journals Gravitational Radiation by Ultrarelativistic Bodies

1974 ◽  
Vol 64 ◽  
pp. 60-60
Author(s):  
Peter Jocelyn Westervelt
Keyword(s):  
General Relativity ◽  
Gravitational Waves ◽  
Direct Observation ◽  
Gravitational Radiation ◽  
Indirect Evidence ◽  
Forward Direction ◽  
Recent Analysis ◽  
Circular Orbits ◽  
Low Efficiency

I have shown (Westervelt, 1966) that ultrarelativistic bodies do not radiate gravitational waves in the forward direction. This work has been extended so as to apply to circular orbits. Even if low efficiency of generation precludes direct observation of gravitational waves, indirect evidence for their existence is available in a recent analysis (Westervelt, 1969) of Shapiro's fourth test of general relativity.

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