Current measurements of the gravitational 'constant' as a function of the mass separation

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Gravitational Constant, Gravitational Fields, Mass Distribution, Null Zones, Polarization Characteristics, Separation, Vacuum Effects

Scientific paper

Recent measurements of the dependence of the gravitational constant on mass separation are discussed in relation to the earlier work of Long (1976) in which an expression relating the two properties was demonstrated. Consideration is given to the precise null experiment of Spero et al. (1980), in which a nonlocal mass charge density was sought in the center of a long cylinder in which there should be zero gravitational field according to the inverse square law, and it is pointed out that the negative results of the experiment are ambiguous due to the presence of a possible, nondetectable vacuum polarization process. The parameter relating the gravitational constant to the mass separation is then calculated for various other experimental determinations of the gravitational constant at different mass separations, and it is shown that although most of the experimental determinations contain large errors, the distribution of the values tends to support the small positive value of this parameter.

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