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Active mass in relativistic gravity - Theoretical interpretation of the Kreuzer experiment
Will, C. M.
Astrophysical Journal, vol. 204, Feb. 15, 1976, pt. 1, p. 224-234. (ApJ Homepage)
Publication Date:
NASA/STI Keywords:
Charged Particles, Gravitation Theory, Particle Mass, Particle Theory, Relativity, Bromine, Conservation Laws, Equations Of Motion, Fluorine, Ideal Fluids, Maxwell Equation, Nuclei (Nuclear Physics), Particle Interactions
Bibliographic Code:


A 1966 experiment performed by Kreuzer set an upper limit of 5 parts in 100,000 on the difference in the ratio of active to passive mass between fluorine and bromine. (Active mass of a body is the mass that generates gravity, while passive mass is the mass that responds to gravity.) A parameterized post-Newtonian formalism for the spacetime metric of a system of charged point particles is introduced using parameters whose values vary from gravitation theory to gravitation theory. The prediction of this formalism for the active gravitational masses of fluorine and bromine nuclei is compared with the results of the Kreuzer experiment, and an upper limit is placed on a combination of these PPN parameters. By making a detailed comparison of the point-mass formalism with the standard perfect-fluid PPN formalism, it is shown that for theories of gravitation whose perfect-fluid equations are blind to the different forms of internal energy and pressure in the fluid, the perfect-fluid PPN parameters must satisfy a certain constraint. It is also shown that any theory of gravity that possesses post-Newtonian integral conservation laws for total momentum automatically agrees with the Kreuzer experiment.

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