scholarly journals Reduced-order surrogate models for scalar-tensor gravity in the strong field regime and applications to binary pulsars and GW170817

2019 ◽  
Vol 100 (6) ◽  
Author(s):  
Junjie Zhao ◽  
Lijing Shao ◽  
Zhoujian Cao ◽  
Bo-Qiang Ma
Keyword(s):  
Strong Field ◽  
Surrogate Models ◽  
Reduced Order ◽  
Binary Pulsars

Binary pulsars as probes of relativistic gravity

1992 ◽  
Vol 341 (1660) ◽  
pp. 135-149 ◽  
Keyword(s):  
Binary Systems ◽  
Strong Field ◽  
Field Tests ◽  
Weak Field ◽  
Multidimensional Space ◽  
Alternative Theory ◽  
Theory Approach ◽  
Binary Pulsars ◽  
Weak Field Limit ◽  
Self Gravity

Until now, most experiments have succeeded in testing relativistic gravity only in its extreme weak-field limit. Because of the strong self-gravity of neutron stars, observations of pulsars in binary systems provide a unique opportunity for probing the strong-field régime of relativistic gravity. The two basic approaches to using binary pulsar measurements as probes of relativistic gravity are reviewed: the phenomenological (‘parametrized post-keplerian’ formalism) and the alternative-theory approach (multidimensional space of possible theories). The experimental constraints recently derived from the actual timing observations of three binary pulsars are summarized. General relativity passes these new, strong-field tests with complete success.

scholarly journals Binary pulsars and tests of general relativity

2009 ◽  
Vol 5 (S261) ◽  
pp. 218-227 ◽  
Author(s):  
I. H. Stairs
Keyword(s):  
General Relativity ◽  
Neutron Star ◽  
White Dwarf ◽  
Strong Field ◽  
Binding Energies ◽  
Tests Of General Relativity ◽  
Binary Pulsars ◽  
The Difference

AbstractBinary pulsars are a valuable laboratory for gravitational experiments. Double-neutron-star systems such as the double pulsar provide the most stringent tests of strong-field gravity available to date, while pulsars with white-dwarf companions constrain departures from general relativity based on the difference in gravitational binding energies in the two stars. Future observations may open up entirely new tests of the predictions of general relativity.

scholarly journals Relativistic effect of gravitational deflection of light in binary pulsars

1996 ◽  
Vol 160 ◽  
pp. 131
Author(s):  
Oleg V. Doroshenko ◽  
Sergei M. Kopeikin
Keyword(s):  
Gravitational Field ◽  
Strong Field ◽  
Alternative Theories Of Gravity ◽  
Estimation Of Parameters ◽  
Orbital Inclination ◽  
Binary Pulsars ◽  
Deflection Of Light ◽  
Shapiro Effect ◽  
Gravitational Deflection Of Light ◽  
Gravitational Deflection

Timing formula for data processing of observations of binary pulsars that accounts for the relativistic deflection of light in the gravitational field of the pulsar’s companion is presented, and the measurability of this effect along with its variance estimates is discussed. The deflection of the pulsar’s pulse trajectory in the gravitational field of its companion leads to variation in the pulsar’s rotational phase. This variation appears as a narrow sharp growth of the magnitude of the post-fit residuals in the vicinity of the moment of the superior conjunction of the pulsar with its companion. In contrast to the relativistic Shapiro effect, the amplitude of the effect of gravitational deflection of the pulsar radio beam has two peaks with opposite signs, which become sharper as the inclinationiof the pulsar’s orbit approaches to the right angle. The effect under consideration influences the estimation of parameters of the relativistic Shapiro effect in the binary pulsars with nearly edgewise orbits. Its inclusion in the fitting procedure provides a more careful measurement of the sine of the orbital inclinationi, as well as the masses of the pulsar and its companion. This permits an improved testing of alternative theories of gravity in the strong field regime. The effect of the gravitational deflection of light has been numerically investigated for binary pulsars with nearly edgewise orbits. It is shown that the effect is observed in general only when cosi is less than 0.003. This estimate becomes less restrictive as the pulsar’s spin axis approaches the line of sight.

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 New Constraints on Preferred Frame Effects from Binary Pulsars

2012 ◽  
Vol 8 (S291) ◽  
pp. 496-498 ◽  
Author(s):  
Lijing Shao ◽  
Norbert Wex ◽  
Michael Kramer
Keyword(s):  
Strong Field ◽  
Weak Field ◽  
Optical Observations ◽  
Orbital Eccentricity ◽  
Tensor Fields ◽  
Metric Tensor ◽  
Preferred Frame ◽  
Binary Pulsars ◽  
Canonical Metric ◽  
Ppn Parameters

AbstractPreferred frame effects (PFEs) are predicted by a number of alternative gravity theories which include vector or additional tensor fields, besides the canonical metric tensor. In the framework of parametrized post-Newtonian (PPN) formalism, we investigate PFEs in the orbital dynamics of binary pulsars, characterized by the two strong-field PPN parameters, and . In the limit of a small orbital eccentricity, and contributions decouple. By utilizing recent radio timing results and optical observations of PSRs J1012+5307 and J1738+0333, we obtained the best limits of and in the strong-field regime. The constraint on also surpasses its counterpart in the weak-field regime.

scholarly journals Manifestations of Horndeski theory in binary systems with pulsars.

2018 ◽  
Vol 191 ◽  
pp. 07011
Author(s):  
Nikita Avdeev ◽  
Polina Dyadina ◽  
Stanislav Alexeyev
Keyword(s):  
Observational Data ◽  
Binary Systems ◽  
Strong Field ◽  
Binary Pulsars

Subclass of Horndeski gravity without Vainstein screening mechanism is tested in strong field regime of binary pulsars. Two specific cases of the Horndeski gravity are considered: the hybrid metric-Palatini f(R)-gravity and massive Brans-Dicke theory. The observational data of PSR J1738+0333, PSR J0737-3039, PSR J1012+5307 is used for obtaining constraints.

scholarly journals Testing General Relativity with black hole X-ray data: a progress report

2021 ◽  
Author(s):  
Cosimo Bambi
Keyword(s):  
General Relativity ◽  
Black Hole ◽  
Strong Field ◽  
Weak Field ◽  
Progress Report ◽  
X Ray ◽  
Binary Pulsars ◽  
The Past ◽  
Modern Physics ◽  
New Generation

AbstractEinstein’s theory of General Relativity is one of the pillars of modern physics. For decades, the theory has been mainly tested in the weak field regime with experiments in the Solar System and observations of binary pulsars. Thanks to a new generation of observational facilities, the past 5 years have seen remarkable changes in this field and there are now numerous efforts for testing General Relativity in the strong field regime with black holes and neutron stars using different techniques. Here I will review the work of my group at Fudan University devoted to test General Relativity with black hole X-ray data.

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