scholarly journals Gravitational-Wave Tests of General Relativity with Ground-Based Detectors and Pulsar-Timing Arrays

2013 ◽  
Vol 16 (1) ◽  
Author(s):  
Nicolás Yunes ◽  
Xavier Siemens
Keyword(s):  
General Relativity ◽  
Gravitational Wave ◽  
Tests Of General Relativity ◽  
Pulsar Timing

scholarly journals The confrontation between general relativity and experiment

2009 ◽  
Vol 5 (S261) ◽  
pp. 198-199
Author(s):  
Clifford M. Will
Keyword(s):  
General Relativity ◽  
Gravitational Wave ◽  
Equivalence Principle ◽  
Gamma Ray ◽  
Strong Field ◽  
Weak Field ◽  
X Ray ◽  
Spacetime Geometry ◽  
Tests Of General Relativity ◽  
Laser Interferometric

AbstractWe review the experimental evidence for Einstein's general relativity. A variety of high precision null experiments confirm the Einstein Equivalence Principle, which underlies the concept that gravitation is synonymous with spacetime geometry, and must be described by a metric theory. Solar system experiments that test the weak-field, post-Newtonian limit of metric theories strongly favor general relativity. Binary pulsars test gravitational-wave damping and aspects of strong-field general relativity. During the coming decades, tests of general relativity in new regimes may be possible. Laser interferometric gravitational-wave observatories on Earth and in space may provide new tests via precise measurements of the properties of gravitational waves. Future efforts using X-ray, infrared, gamma-ray and gravitational-wave astronomy may one day test general relativity in the strong-field regime near black holes and neutron stars.

scholarly journals Multiparameter Tests of General Relativity Using Multiband Gravitational-Wave Observations

2020 ◽  
Vol 125 (20) ◽  
Author(s):  
Anuradha Gupta ◽  
Sayantani Datta ◽  
Shilpa Kastha ◽  
Ssohrab Borhanian ◽  
K. G. Arun ◽  
...  
Keyword(s):  
General Relativity ◽  
Gravitational Wave ◽  
Tests Of General Relativity

scholarly journals Parameterized and Consistency Tests of Gravity with GravitationalWaves: Current and Future

Proceedings ◽  
2019 ◽  
Vol 17 (1) ◽  
pp. 5 ◽  
Author(s):  
Zack Carson ◽  
Kent Yagi
Keyword(s):  
General Relativity ◽  
Gravitational Wave ◽  
Gravitational Waves ◽  
Dynamical Regime ◽  
Future Prospects ◽  
Tests Of General Relativity ◽  
Open Questions ◽  
Tests Of Gravity ◽  
Multi Band

Gravitational wave observations offer unique opportunities to probe gravity in the strong and dynamical regime, which was difficult to access previously. We here review two theory-agnostic ways to carry out tests of general relativity with gravitational waves, namely (i) parameterized waveform tests and (ii) consistency tests between the inspiral and merger-ringdown portions. For each method, we explain the formalism, followed by results from existing events, and finally we discuss future prospects with upgraded detectors, including the possibility of using multi-band gravitational-wave observations with ground-based and space-borne interferometers. We show that such future observations have the potential to improve upon current bounds on theories beyond general relativity by many orders of magnitude. We conclude by listing several open questions that remain to be addressed.

scholarly journals Stability of pulsar rotational and orbital periods

2009 ◽  
Vol 5 (H15) ◽  
pp. 226-227
Author(s):  
Sergei Kopeikin
Keyword(s):  
General Relativity ◽  
Time Scale ◽  
Random Noise ◽  
Low Frequency ◽  
Frequency Noise ◽  
Tests Of General Relativity ◽  
Orbital Parameters ◽  
Pulsar Timing ◽  
Orbital Periods ◽  
The Stability

AbstractMillisecond and binary pulsars are the most stable astronomical standards of frequency. They can be applied to solving a number of problems in astronomy and time-keeping metrology including the search for a stochastic gravitational wave background in the early universe, testing general relativity, and establishing a new time-scale. The full exploration of pulsar properties requires that proper unbiased estimates of spin and orbital parameters of the pulsar be obtained. These estimates depend essentially on the random noise components present in pulsar timing residuals. The instrumental white noise has predictable statistical properties and makes no harm for interpretation of timing observations, while the astrophysical/geophyeical low-frequency noise corrupts them, thus, reducing the quality of tests of general relativity and decreasing the stability of the pulsar time scale.

scholarly journals The first 5 years of gravitational-wave astrophysics

Science ◽  
2021 ◽  
Vol 372 (6546) ◽  
pp. eabc7397
Author(s):  
Salvatore Vitale
Keyword(s):  
General Relativity ◽  
Gravitational Wave ◽  
Electromagnetic Waves ◽  
Gamma Ray ◽  
Direct Consequence ◽  
Compact Objects ◽  
Tests Of General Relativity ◽  
Astrophysical Objects ◽  
Progenitor Stars ◽  
The Universe

Gravitational waves are ripples in spacetime generated by the acceleration of astrophysical objects; a direct consequence of general relativity, they were first directly observed in 2015. Here, I review the first 5 years of gravitational-wave detections. More than 50 gravitational-wave events have been found, emitted by pairs of merging compact objects such as neutron stars and black holes. These signals yield insights into the formation of compact objects and their progenitor stars, enable stringent tests of general relativity, and constrain the behavior of matter at densities higher than that of an atomic nucleus. Mergers that emit both gravitational and electromagnetic waves probe the formation of short gamma-ray bursts and the nucleosynthesis of heavy elements, and they measure the local expansion rate of the Universe.

scholarly journals The Polarizations of Gravitational Waves

Universe ◽  
2018 ◽  
Vol 4 (8) ◽  
pp. 85 ◽  
Author(s):  
Yungui Gong ◽  
Shaoqi Hou
Keyword(s):  
General Relativity ◽  
Gravitational Wave ◽  
Gravitational Waves ◽  
High Speed ◽  
Strong Field ◽  
Alternative Theories Of Gravity ◽  
Pulsar Timing ◽  
Theories Of Gravity ◽  
Alternative Theories

The gravitational wave provides a new method to examine General Relativity and its alternatives in the high speed, strong field regime. Alternative theories of gravity generally predict more polarizations than General Relativity, so it is important to study the polarization contents of theories of gravity to reveal the nature of gravity. In this talk, we analyze the polarization contents of Horndeski theory and f(R) gravity. We find out that in addition to the familiar plus and cross polarizations, a massless Horndeski theory predicts an extra transverse polarization, and there is a mix of pure longitudinal and transverse breathing polarizations in the massive Horndeski theory and f(R) gravity. It is possible to use pulsar timing arrays to detect the extra polarizations in these theories. We also point out that the classification of polarizations using Newman–Penrose variables cannot be applied to massive modes. It cannot be used to classify polarizations in Einstein-æther theory or generalized Tensor-Vector-Scalar (TeVeS) theory, either.

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