Article1998

A Free-Fall Determination of the Newtonian Constant of Gravity

Joshua Peter Schwarz · Douglas S. Robertson · Timothy M. Niebauer · J. E. Faller

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Scientific Measurement and Uncertainty Evaluation Relativity and Gravitational Theory Geophysics and Gravity Measurements

Abstract

Recent determinations of the Newtonian constant of gravity have produced values that differ by nearly 40 times their individual error estimates (more than 0.5%). In an attempt to help resolve this situation, an experiment that uses the gravity field of a one-half metric ton source mass to perturb the trajectory of a free-falling mass and laser interferometry to track the falling object was performed. This experiment does not suspend the test mass from a support system. It is therefore free of many systematic errors associated with supports. The measured value was G = (6.6873 +/- 0. 0094) x 10(-11) m3 kg-1 sec-2.

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References

1982Redetermination of the Newtonian Gravitational Constant G 1997The Newtonian gravitational constant: recent measurements and related studies 1995Does the Time-of-Swing Method Give a Correct Value of the Newtonian Gravitational Constant?1995A new precise determination of Newton's gravitational constant

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