scholarly journals Gravitational-wave versus binary-pulsar tests of strong-field gravity

1998 ◽  
Vol 58 (4) ◽  
Author(s):  
Thibault Damour ◽  
Gilles Esposito-Farèse
Keyword(s):  
Gravitational Wave ◽  
Strong Field ◽  
Wave Versus ◽  
Binary Pulsar

scholarly journals Gravitational-wave versus x-ray tests of strong-field gravity

2020 ◽  
Vol 37 (13) ◽  
pp. 135008 ◽  
Author(s):  
Alejandro Cárdenas-Avendaño ◽  
Sourabh Nampalliwar ◽  
Nicolás Yunes
Keyword(s):  
Gravitational Wave ◽  
Strong Field ◽  
Wave Versus ◽  
X Ray

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.

The Discovery of Gravitational Wave Emission

2018 ◽  
pp. 103-105
Author(s):  
Alvaro De Rújula
Keyword(s):  
General Relativity ◽  
Neutron Stars ◽  
Gravitational Wave ◽  
Binary Stars ◽  
Binary Pulsar ◽  
Wave Emission

Neutron stars, binary stars and pulsars. The Arecibo radio antenna. The discovery of the first binary pulsar (PS1913+16) by Husle and Taylor. This pulsar’s understanding in general relativity: A fantastic success.

scholarly journals The tune of the universe: the role of plasma in tests of strong-field gravity

2021 ◽  
Author(s):  
Vitor Cardoso ◽  
Wen-Di Guo ◽  
Caio F B Macedo ◽  
Paolo Pani
Keyword(s):  
Gravitational Wave ◽  
Electromagnetic Waves ◽  
Degrees Of Freedom ◽  
Strong Field ◽  
Low Frequency ◽  
Electromagnetic Emission ◽  
Modified Theories Of Gravity ◽  
Black Hole Binaries ◽  
Long Baseline ◽  
Electromagnetic Probes

Abstract Gravitational-wave astronomy, together with precise pulsar timing and long baseline interferometry, is changing our ability to perform tests of fundamental physics with astrophysical observations. Some of these tests are based on electromagnetic probes or electrically charged bodies, and assume an empty universe. However, the cosmos is filled with plasma, a dilute medium which prevents the propagation of low-frequency, small-amplitude electromagnetic waves. We show that the plasma hinders our ability to perform some strong-field gravity tests, in particular: (i) nonlinear plasma effects dramatically quench plasma-driven superradiant instabilities; (ii) the contribution of electromagnetic emission to the inspiral of charged black hole binaries is strongly suppressed; (iii) electromagnetic-driven secondary modes, although present in the spectrum of charged black holes, are excited to negligible amplitude in the gravitational-wave ringdown signal. The last two effects are relevant also in the case of massive fields that propagate in vacuum and can jeopardize tests of modified theories of gravity containing massive degrees of freedom.

scholarly journals Post-Newtonian gravitational and scalar waves in scalar-Gauss-Bonnet gravity

2021 ◽  
Author(s):  
Banafsheh Shiralilou ◽  
Tanja Hinderer ◽  
Samaya Nissanke ◽  
Nestor Ortiz ◽  
Helvi Witek
Keyword(s):  
General Relativity ◽  
Black Hole ◽  
Gravitational Wave ◽  
Strong Field ◽  
Field Tests ◽  
Theoretical Modelling ◽  
Bonnet Gravity ◽  
Weak Coupling Approximation ◽  
Tests Of Gravity ◽  
The Impact

Abstract Gravitational waves emitted by black hole binary inspiral and mergers enable unprecedented strong-field tests of gravity, requiring accurate theoretical modelling of the expected signals in extensions of General Relativity. In this paper we model the gravitational wave emission of inspiralling binaries in scalar Gauss-Bonnet gravity theories. Going beyond the weak-coupling approximation, we derive the gravitational waveform to relative first post-Newtonian order beyond the quadrupole approximation and calculate new contributions from nonlinear curvature terms. We also compute the scalar waveform to relative 0.5PN order beyond the leading -0.5PN order terms. We quantify the effect of these terms and provide ready-to-implement gravitational wave and scalar waveforms as well as the Fourier domain phase for quasi-circular binaries. We also perform a parameter space study, which indicates that the values of black hole scalar charges play a crucial role in the detectability of deviation from General Relativity. We also compare the scalar waveforms to numerical relativity simulations to assess the impact of the relativistic corrections to the scalar radiation. Our results provide important foundations for future precision tests of gravity.

scholarly journals Strong-field tests of f(R)-gravity in binary pulsars

2016 ◽  
Vol 41 ◽  
pp. 1660131 ◽  
Author(s):  
Polina I. Dyadina ◽  
Stanislav O. Alexeyev ◽  
Salvatore Capozziello ◽  
Mariafelicia De Laurentis ◽  
Kristina A. Rannu
Keyword(s):  
Solar System ◽  
Strong Field ◽  
Field Tests ◽  
Analytic Formula ◽  
Gravity Models ◽  
Binary Pulsar ◽  
Binary Pulsars ◽  
System Data

We develop the parameterized post-Keplerian approach for class of analytic [Formula: see text]-gravity models. Using the double binary pulsar system PSR J0737-3039 data we obtain restrictions on the parameters of this class of [Formula: see text]-models and show that [Formula: see text]-gravity is not ruled out by the observations in strong field regime. The additional and more strong corresponding restriction is extracted from solar system data.

scholarly journals TESTS OF GENERAL RELATIVITY AND ALTERNATIVE THEORIES OF GRAVITY USING GRAVITATIONAL WAVE OBSERVATIONS

2013 ◽  
Vol 22 (01) ◽  
pp. 1341012 ◽  
Author(s):  
K. G. ARUN ◽  
ARCHANA PAI
Keyword(s):  
General Relativity ◽  
Gravitational Wave ◽  
Strong Field ◽  
Information Matrix ◽  
Simons Theory ◽  
Alternative Theories Of Gravity ◽  
Newtonian Theory ◽  
Theories Of Gravity ◽  
Model Independent ◽  
Alternative Theories

Gravitational wave (GW) observations of coalescing compact binaries will be unique probes of strong-field, dynamical aspects of relativistic gravity. We present a short review of various schemes proposed in the literature to test general relativity (GR) and alternative theories of gravity using inspiral waveforms. Broadly these schemes may be classified into two types: model dependent and model independent. In the model dependent category, GW observations are compared against a specific waveform model representative of a particular theory or a class of theories such as scalar-tensor theories, dynamical Chern–Simons theory and massive graviton theories. Model independent tests are attempts to write down a parametrized gravitational waveform where the free parameters take different values for different theories and (at least some of) which can be constrained by GW observations. We revisit some of the proposed bounds in the case of downscaled LISA configuration (eLISA) and compare them with the original LISA configuration. We also compare the expected bounds on alternative theories of gravity from ground-based and space-based detectors and find that space-based GW detectors can test GR and other theories of gravity with unprecedented accuracies. We then focus on a recent proposal to use singular value decomposition of the Fisher information matrix to improve the accuracies with which post-Newtonian theory can be tested. We extend those results to the case of space-based detector eLISA and discuss its implications.

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