Studying Antimatter Gravity with Muonium
Paul Scherrer Institute, 5232 Villigen, Switzerland
ETH Zürich, 8092 Zürich, Switzerland
Illinois Institute of Technology, Chicago, IL 60616, USA
Center for Astrophysics and Space Sciences, University of California at San Diego, La Jolla, CA 92093, USA
Harvard-Smithsonian Center for Astrophysics, Cambridge, MA 02138, USA
Author to whom correspondence should be addressed.
Received: 13 February 2018 / Revised: 23 March 2018 / Accepted: 26 March 2018 / Published: 9 April 2018
The gravitational acceleration of antimatter,
, has yet to be directly measured; an unexpected outcome of its measurement could change our understanding of gravity, the universe, and the possibility of a fifth force. Three avenues are apparent for such a measurement: antihydrogen, positronium, and muonium, the last requiring a precision atom interferometer and novel muonium beam under development. The interferometer and its few-picometer alignment and calibration systems appear feasible. With 100 nm grating pitch, measurements of
to 10%, 1%, or better can be envisioned. These could constitute the first gravitational measurements of leptonic matter, of 2nd-generation matter, and possibly, of antimatter.
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Antognini, A.; Kaplan, D.M.; Kirch, K.; Knecht, A.; Mancini, D.C.; Phillips, J.D.; Phillips, T.J.; Reasenberg, R.D.; Roberts, T.J.; Soter, A. Studying Antimatter Gravity with Muonium. Atoms 2018, 6, 17.
Antognini A, Kaplan DM, Kirch K, Knecht A, Mancini DC, Phillips JD, Phillips TJ, Reasenberg RD, Roberts TJ, Soter A. Studying Antimatter Gravity with Muonium. Atoms. 2018; 6(2):17.
Antognini, Aldo; Kaplan, Daniel M.; Kirch, Klaus; Knecht, Andreas; Mancini, Derrick C.; Phillips, James D.; Phillips, Thomas J.; Reasenberg, Robert D.; Roberts, Thomas J.; Soter, Anna. 2018. "Studying Antimatter Gravity with Muonium." Atoms 6, no. 2: 17.
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