Testing antimatter gravity with muonium

@article{Kirch2014TestingAG,
  title={Testing antimatter gravity with muonium},
  author={K. Kirch and Kim Siang Khaw},
  journal={Atoms},
  year={2014},
  volume={6},
  pages={17}
}
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… 

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