Gravitational radiation from binary systems in alternative metric theories of gravity - Dipole radiation and the binary pulsar

1977 ◽  
Vol 214 ◽  
pp. 826 ◽  
Author(s):  
C. M. Will
Keyword(s):  
Gravitational Radiation ◽  
Binary Systems ◽  
Dipole Radiation ◽  
Binary Pulsar ◽  
Theories Of Gravity

scholarly journals The Discovery of the Most Accelerated Binary Pulsar

2017 ◽  
Vol 13 (S337) ◽  
pp. 134-137
Author(s):  
Andrew D. Cameron
Keyword(s):  
Neutron Star ◽  
Orbital Period ◽  
Binary Systems ◽  
Galactic Plane ◽  
Low Latitude ◽  
Binary Pulsar ◽  
Binary Pulsars ◽  
Searching Strategy ◽  
Theories Of Gravity ◽  
Relativistic Parameter

AbstractPulsars in relativistic binary systems have emerged as fantastic natural laboratories for testing theories of gravity, the most prominent example being the double pulsar, PSR J0737–3039. The HTRU-South Low Latitude pulsar survey represents one of the most sensitive blind pulsar surveys taken of the southern Galactic plane to date, and its primary aim has been the discovery of new relativistic binary pulsars. Here we present our binary pulsar searching strategy and report on the survey’s flagship discovery, PSR J1757–1854. A 21.5-ms pulsar in a relativistic binary with an orbital period of 4.4 hours and an eccentricity of 0.61, this double neutron star (DNS) system is the most accelerated pulsar binary known, and probes a relativistic parameter space not yet explored by previous pulsar binaries.

scholarly journals Gravitational radiation and the binary pulsar

Nature ◽  
1982 ◽  
Vol 297 (5865) ◽  
pp. 357-358 ◽  
Author(s):  
Virginia Trimble
Keyword(s):  
Gravitational Radiation ◽  
Binary Pulsar

scholarly journals WAVELESS APPROXIMATION THEORIES OF GRAVITY

2008 ◽  
Vol 17 (02) ◽  
pp. 265-273 ◽  
Author(s):  
JAMES A. ISENBERG
Keyword(s):  
Gravitational Field ◽  
Gravitational Radiation ◽  
Elliptic Equations ◽  
Degrees Of Freedom ◽  
Dynamic Instability ◽  
Accurate Approximation ◽  
Time Step ◽  
Einstein Theory ◽  
Physical Systems ◽  
Theories Of Gravity

The analysis of a general multibody physical system governed by Einstein's equations is quite difficult, even if numerical methods (on a computer) are used. Some of the difficulties — many coupled degrees of freedom, dynamic instability — are associated with the presence of gravitational waves. We have developed a number of "waveless approximation theories" (WAT's) which repress the gravitational radiation and thereby simplify the analysis. The matter, according to these theories, evolves dynamically. The gravitational field, however, is determined at each time step by a set of elliptic equations with matter sources. There is reason to believe that for many physical systems, the WAT-generated system evolution is a very accurate approximation to that generated by the full Einstein theory.

Approximation methods in gravitational-radiation theory

1986 ◽  
Vol 64 (2) ◽  
pp. 140-145 ◽  
Author(s):  
Clifford M. Will
Keyword(s):  
Gravitational Radiation ◽  
Normal Modes ◽  
Slow Motion ◽  
Radiation Reaction ◽  
Weak Field ◽  
Approximation Methods ◽  
Binary Pulsar ◽  
Radiation Theory ◽  
Recent Developments ◽  
Reaction Forces

The observation of gravitational-radiation damping in the binary pulsar PSR 1913 + 16 and the ongoing experimental search for gravitational waves of extraterrestrial origin have made the theory of gravitational radiation an active branch of classical general relativity. In calculations of gravitational radiation, approximation methods play a crucial role. We summarize recent developments in two areas in which approximations are important: (a) the quadrupole approximation, which determines the energy flux and the radiation reaction forces in weak-field, slow-motion, source-within-the-near-zone systems such as the binary pulsar; and (b) the normal modes of oscillation of black holes, where the Wentzel–Kramers–Brillouin approximation gives accurate estimates of the complex frequencies of the modes.

PRECISION TESTS OF THEORIES OF GRAVITY USING PULSARS

2014 ◽  
Vol 23 (03) ◽  
pp. 1430004 ◽  
Author(s):  
MICHAEL KRAMER
Keyword(s):  
Scalar Fields ◽  
Alternative Theories Of Gravity ◽  
Dipole Radiation ◽  
Geodetic Precession ◽  
Gravity Effects ◽  
Theories Of Gravity ◽  
Orbital Precession ◽  
Tests Of Gravity ◽  
Alternative Theories ◽  
Strong Equivalence Principle

In the quest of understanding gravity, binary pulsars provide indispensable laboratories for precision tests of gravity. Effects that can be studied in great detail include the emission of gravitational waves, Shapiro delay, orbital precession and more. But also fundamental differences between general relativity and alternative theories of gravity can be probed, such as possible violations of the strong equivalence principle, preferred frame effects or the existence of gravitational dipole radiation or scalar fields. Also the effects of spin precession in strongly self-gravitating bodies can be studied by observing effects of geodetic precession.

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