Welcome to the homepage of the AEgIS
experiment at the CERN antiproton decelerator


Does antihydrogen fall with the same acceleration as hydrogen?

The principle of universality of free fall (or weak equivalence principle, WEP) states that all bodies fall with the same acceleration, independent of mass and composition. The WEP has been tested with very high precision for matter but never for antimatter. AEgIS is an experiment to test the WEP with antiprotons at the European laboratory CERN, using the antiproton decelerator (AD). AEgIS is a collaboration of physicists from all around the world.