Go to Duke High Energy Physics Home Page The gravitational force on antimatter has never been directly measured, largely because electromagnetic forces are too strong compared to gravitational forces and no form of low-energy neutral antimatter has been available. However, the technology now exists to make low-energy antihydrogen. We are working on a project to develop an atomic hydrogen interferometer that can determine the force of gravity on hydrogen and antihydrogen by measuring the phase shift caused by gravity. A precise difference measurement between hydrogen and antihydrogen would be capable of detecting a new force that couples differently to matter and antimatter.
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