Published October 30, 1989
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Testing the inverse-square law of gravity on a 465-m tower
Chicago
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Abstract
We have performed a test of Newton's universal theory of gravitation by comparing gravity measured on a tower to an upward continuation of the surface gravity field. We measured gravity at 12 heights on a 465-m tower at the Nevada Test Site and, in addition, made measurements at 281 locations on the ground. The surface points fell within 91 optimally chosen sectors that extended out to 2.6 km from the tower. These data were combined with 60000 additional surface gravity measurements within 300 km of the tower. We used a surface integral derived from Laplace's equation to upward continue the surface gravity field and our observations are consistent with the Newtonian predictions to within (-60±95)×10^-8 m sec^-2 at the top of the tower.
Additional Information
©1989 The American Physical Society Received 14 June 1989 We would like to acknowledge stimulating discussions with D. Eckhardt, A. Lazarewicz, F. Stacey, G. Tuck, and J. Hearst. We thank J. Gehring, B. McKinney, and M. Pravica for their assistance and we are especially grateful to A. Cogbill for allowing us to use his gravimeters and for many stimulating discussions. We are grateful for the encouragement and support of the nuclear test containment program at LLNL. All work was supported by the U.S. Department of Energy under Contracts No. DEAC-0381-ER40050 and No. W-7405-ENG-48.Files
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