Feasibility of a second-order gravitational red-shift experiment

Physics

Scientific paper

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Field Theory (Physics), Gravitation Theory, Gravitational Effects, Red Shift, Atomic Clocks, Frequency Shift, Gravitational Fields, Ground Stations, Orbital Elements, Transponders

Scientific paper

The number of gravitation experiments undertaken since the advent of Einstein's theory of gravitation is quite small, with, so far, only the famous perihelion-advance experiment and a recent lunar-laser-ranging experiment being capable of measuring a nonlinear, second-order effect. It now appears that another distinct test of the second-order term may be feasible through the use of very stable atomic clocks. This experiment, which would measure the second-order gravitational red-shift, is a bona fide test of the field equations of gravity, not just a test of the underlying principle of equivalence. The nature of such an experiment, the basic equations, model-orbit calculations, and some tracking-accuracy requirements are presented. It is concluded that current space-probe tracking capabilities cannot determine all the necessary orbital parameters with sufficient accuracy for this experiment at the present time.

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