1987•Physical Review LettersRequires access

Galilean test for the fifth force

T. M. Niebauer, M. McHugh, J. E. Faller

Abstract

We have carried out a direct free-fall experiment to measure the differential acceleration between two different materials (copper and uranium) falling in the Earth's gravitational field. The differential acceleration was measured to be less than 5 parts in ${10}^{10}$ of the normal gravitational acceleration. This null result puts new limits on the strength and range of the proposed fifth force.

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Key concepts: Fifth force, Acceleration, Physics, Gravitational field, Gravitational acceleration, Gravitation, Galilean, Differential (mechanical device)