# Model-dependence of Shapiro time delay and the 'speed of gravity/speed of light' controversy

@article{Carlip2004ModeldependenceOS, title={Model-dependence of Shapiro time delay and the 'speed of gravity/speed of light' controversy}, author={Steven Carlip}, journal={Classical and Quantum Gravity}, year={2004}, volume={21}, pages={3803-3812} }

Fomalont and Kopeikin have recently succeeded in measuring the velocity-dependent component of the Shapiro time delay of light from a quasar passing behind Jupiter. While there is general agreement that this observation tests the gravitomagnetic properties of the gravitational field, a controversy has emerged over the question of whether the results depend on the speed of light, c, or the speed of gravity, cg. By analysing the Shapiro time delay in a set of 'preferred frame' models, I…

## 44 Citations

Comment on ‘Model-dependence of Shapiro time delay and the “speed of gravity/speed of light” controversy’

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In a recent paper published in (2004 Class. Quantum Grav. 21 3803) Carlip used a vector–tensor theory of gravity to calculate the Shapiro time delay by a moving gravitational lens. He claimed that…

COMMENTS ON "ON THE SPEED OF GRAVITY AND THE JUPITER/QUASAR MEASUREMENT" BY S. SAMUEL

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A recent review article by S. Samuel "On the Speed of Gravity and the Jupiter/Quasar Measurement" published as Int. J. Mod. Phys. D13, 1753 (2004), provides the reader with a misleading "theory" of…

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We describe our explicit Lorentz-invariant solution of the Einstein and null geodesic equations for the deflection experiment of 2002 September 8 when a massive moving body, Jupiter, passed within…

Reply to the comment on ‘Model dependence of Shapiro time delay and the “speed of gravity/speed of light” controversy’

- Physics
- 2005

I reply to a comment by Kopeikin (2005 Class. Quantum Grav. 22 5181) claiming that a previous paper of mine (Carlip 2004 Class. Quantum Grav. 21 3803) missed a hidden dependence of the Shapiro time…

The Confrontation between General Relativity and Experiment

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Tests of general relativity at the post-Newtonian level have reached high precision, including the light deflection, the Shapiro time delay, the perihelion advance of Mercury, and the Nordtvedt effect in lunar motion.

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The status of experimental tests of general relativity and of theoretical frameworks for analyzing them is reviewed. Einstein's equivalence principle (EEP) is well supported by ex- periments such as…

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The time delay experienced by a light ray as it passes through a changing gravitational potential by a nonzero mass distribution along the line of sight is usually referred to as “Shapiro” delay.…

A SHORT COMMENT ON THE JUPITER TIME-DELAY CONTROVERSIES

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The observation of Shapiro time delay of quasar light passing near Jupiter1 generated considerable excitement, but also considerable controversy. The disagreements involve two distinct issues: (i) Is…

Gravitational bending of light by planetary multipoles and its measurement with microarcsecond astronomical interferometers

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General-relativistic deflection of light by mass, dipole, and quadrupole moments of the gravitational field of a moving massive planet in the solar system is derived in the approximation of the…

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