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Studying Antimatter Gravity with Muonium

1
Paul Scherrer Institute, 5232 Villigen, Switzerland
2
ETH Zürich, 8092 Zürich, Switzerland
3
Illinois Institute of Technology, Chicago, IL 60616, USA
4
Center for Astrophysics and Space Sciences, University of California at San Diego, La Jolla, CA 92093, USA
5
Harvard-Smithsonian Center for Astrophysics, Cambridge, MA 02138, USA
*
Author to whom correspondence should be addressed.
Atoms 2018, 6(2), 17; https://doi.org/10.3390/atoms6020017
Received: 13 February 2018 / Revised: 23 March 2018 / Accepted: 26 March 2018 / Published: 9 April 2018
(This article belongs to the Special Issue Measuring Gravity in the Lab)
The gravitational acceleration of antimatter, g ¯ , 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 g ¯ 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. View Full-Text
Keywords: gravity; antimatter; muonium; atom interferometer; tracking frequency gauge gravity; antimatter; muonium; atom interferometer; tracking frequency gauge
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MDPI and ACS Style

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.

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