Mach's Principle and the Locally Measured Gravitational Constant in General Relativity

Details Mach's Principle and the Locally Measured Gravitational Constant in General Relativity Mach's Principle and the Locally Measured Gravitational Constant in General Relativity

Jan 1962

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1962phrv..125..388b&link_type=abstract

Physical Review, vol. 125, Issue 1, pp. 388-396

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15

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It has been conjectured that a "Mach's principle" might lead to a dependence of the local Newtonian gravitational constant, K, on universe structure, K-1~MR. Einstein and others have suggested that general relativity predicts such a result. A closer analysis, however, including the carrying out of the geodesic equations to second order, seems to indicate that this is not true and that the apparent "Mach's principle" terms involving total universe structure are really only coordinate effects. Further, the measure of gravitating mass obtained in a local, proper Newtonian gravitational experiment is compared in a coordinate-free way to an experimentally measurable inertial mass and found to be related to it in a way independent of the rest of the universe. A generalization of these results is given. It is based on the fact that in general relativity the only way the universe can influence experiments done in an electrically shielded laboratory is through the metric and that this can be "transformed away" to any degree of accuracy for a sufficiently small laboratory. Consequences of this are summarized in Dicke's "strong principle of equivalence." It is noted, however, that there are other statements which might be called "Mach's principles" which are satisfied in general relativity.

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