Gravitational redshift test with the future ACES mission

Abstract

We investigate the performance of the upcoming ACES (Atomic Clock Ensemble in Space) space mission in terms of its primary scientific objective, the test of the gravitational redshift. Whilst the ultimate performance of that test is determined by the systematic uncertainty of the on-board clock at 2-3 ppm, we determine whether, and under which conditions, that limit can be reached in the presence of colored realistic noise, data gaps and orbit determination uncertainties. To do so we have developed several methods and software tools to simulate and analyse ACES data. Using those we find that the target uncertainty of 2-3 ppm can be reached after only a few measurement sessions of 10-20 days each, with a relatively modest requirement on orbit determination of around 300 m.

31 pages, submitted to CQG

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• Preliminary Sensitivity Study for a Gravitational Redshift Measurement with China's Lunar Exploration Project
• Testing the gravitational redshift with an inner Solar System probe: the VERITAS case
• Atom interferometer as a freely falling clock for time-dilation measurements
• Testing screened scalar-tensor theories of gravity with atomic clocks
• Constraints on violation of Lorentz symmetry with clock-comparison redshift experiments
• Cold Atoms in Space: Community Workshop Summary and Proposed Road-Map
• What to expect from scalar-tensor space geodesy