Justin Croom

Physics & Math
Dr. Carlos Ordonez
Current Research Topic: 
An Experiment to Determine the Gravitational Acceleration of Antimatter
Antimatter has held a long enigmatic grip on the physics community ever since the existence of antiparticles was first proposed by Dirac in 1928. All matter has an antimatter counterpart (e.g. the antimatter counterpart to the proton is the antiproton, which has identical mass but opposite charge). As of today, physicists are studying the simplest antiatom we can make in the laboratory. This was somewhat prosaically denominated antihydrogen. Antihydrogen consists of two particles, namely the positron (i.e. the antielectron) and the antiproton. At the AD facility at CERN, physicists are able to create antihydrogen in the lab from various means to investigate its fundamental properties. One of the major inquires is determining the gravitational acceleration of antihydrogen. Currently there is no evidence for the direction of the acceleration of antihydrogen in the Earth’s gravitational field. The purpose of this study is to improve upon previously proposed gravity experiments for antihydrogen and one that can be feasibly carried out at CERN’s AD facility.