On the speed of gravity and the Jupiter/quasar measurement

摘要

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 v(J)/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 went 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.