Does Antimatter Fall Up or Down? Direct Evidence from ALPHA

April 30, 2013

While it seems sensible to suppose that antimatter interacts with gravity the same way ordinary matter does, there’s never been any direct evidence that this is so. In fact some theorists speculate that antimatter might experience antigravity and fall “up” instead of “down.” Joel Fajans and Jonathan Wurtele of the Accelerator and Fusion Research Division, members of the ALPHA Collaboration at CERN, have used ALPHA data to make the first direct measurements of the gravitational mass of atoms of antihydrogen, testing how they fall and in what direction. More>

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