On the Speed of Gravity and the Jupiter/quasar Measurement
نویسنده
چکیده
I present the theory and analysis behind the experiment by Fomalont and Kopeikin involving Jupiter and quasar J0842+1845 that purported to measure the speed of gravity. The computation of the vJ/c correction to the gravitational time delay difference relevant to the experiment is derived, where vJ is the speed of Jupiter as measured from Earth. Since the vJ/c corrections are too small to have been measured in the Jupiter/quasar experiment, it is impossible that the speed of gravity was extracted from the data, and I explain what when wrong with the data analysis. Finally, mistakes are shown in papers by Fomalont and Kopeikin intended to rebut my work and the work of others.
منابع مشابه
Comments on the Paper by S. Samuel " on the Speed of Gravity and the Jupiter/quasar Measurement "
Recent review article by S. Samuel ”On the speed of gravity and the Jupiter/Quasar measurement” published in the International Journal of Modern Physics D, 13 (2004) 1753, provides the reader with a misleading ”theory” of the relativistic time delay in general theory of relativity. Furthermore, it misquotes original publications by Kopeikin and Fomalont & Kopeikin related to the measurement of ...
متن کاملGeneral relativistic model for experimental measurement of the speed of propagation of gravity by VLBI
A relativistic sub-picosecond model of gravitational time delay in radio astronomical observations is worked out and a new experimental test of general relativity is discussed in which the effect of retardation of gravity associated with its finite speed can be observed. As a consequence, the speed of gravity can be measured by differential VLBI observations. Retardation in propagation of gravi...
متن کاملOn the speed of gravity and the v/c corrections to the Shapiro time delay.
Using a relatively simple method, I compute the v/c correction to the gravitational time delay for light passing by a massive object moving with speed v. It turns out that the v/c effects are too small to have been measured in the recent experiment involving Jupiter and quasar J0842+1845 that was used to measure the speed of gravity.
متن کاملOn the Speed of Gravity and Relativistic v/c Corrections to the Shapiro Time Delay
Recent papers by Samuel [1,2] declared that the linearized post-Newtonian v/c effects are too small to have been measured in the recent experiment involving Jupiter and quasar J0842+1845 [3,4,5] that was used to measure the ultimate speed of gravity defined as a fundamental constant entering in front of each time derivative of the metric tensor in the Einstein gravity field equations. We descri...
متن کاملModel-Dependence of Shapiro Time Delay and the “Speed of Gravity/Speed of Light” Controversy
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 Lorentz transformation properties of the gravitational field, a controversy has emerged over the question of whether the results depend on the speed of light, c, or th...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
دوره شماره
صفحات -
تاریخ انتشار 2004