Testing the Weak Equivalence Principle with a free-fall experiment from a balloon

Lorenzini, Enrico; Iafolla, V.; Nozzoli, S.; Orlando, P.; Cosmo, M. L.; Grossi, M. D.

doi:10.1016/s0273-1177(03)90337-1

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“…To date, the validity of the EP has been tested to an accuracy of σ (η) = 1.8 × 10 −13 [1], and several ground-based and space-borne experiments of increasing projected accuracy such as the ground-based principle of equivalence measurement (G-POEM), ICE, HYPER, Einstein Elevator, GG, SR-POEM, STEP and MICROSCOPE are currently under development or have been proposed for the near future [2][3][4][5][6][7][8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Test masses for the G-POEM test of the weak equivalence principle

Reasenberg¹,

Phillips²,

Popescu³

2011

Class. Quantum Grav.

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We describe the design of the test masses that are used in the 'ground-based principle of equivalence measurement' test of the weak equivalence principle. The main features of the design are the incorporation of corner cubes and the use of mass removal and replacement to create pairs of test masses with different test substances. The corner cubes allow for the vertical separation of the test masses to be measured with picometer accuracy by SAO's unique tracking frequency laser gauge, while the mass removal and replacement operations are arranged so that the test masses incorporating different test substances have nominally identical gravitational properties.

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