Abstract

Einstein's weak equivalence principle (WEP) states that gravitationalmass is identical to inertial mass. This hypothesis has withstoodexperimental tests to an impressive accuracy of one part in 1011.Various hypotheses based on theory and observations with matter suggestviolations of WEP for antimatter may exist anywhere from the one part in106 to the 200% level. An observed violation at any level would havea profound impact, e.g. it would offer an explanation as to why matterand antimatter are so distinctly separated in the cosmos. We propose aprecise test of WEP for antiprotons in microgravity. We expect to testWEP for antimatter to about one part in 106, and foresee thatadditional advancements of several orders of magnitude in precision couldfollow with further technical developments.

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