Testing the Strong Equivalence Principle: Detection of the External Field Effect in Rotationally Supported Galaxies

@article{Chae2020TestingTS,
  title={Testing the Strong Equivalence Principle: Detection of the External Field Effect in Rotationally Supported Galaxies},
  author={Kyu-Hyun Chae and Federico Lelli and Harry Desmond and Stacy S. McGaugh and Pengfei Li and James M. Schombert},
  journal={The Astrophysical Journal},
  year={2020},
  volume={904}
}
The strong equivalence principle (SEP) distinguishes general relativity (GR) from other viable theories of gravity. The SEP demands that the internal dynamics of a self-gravitating system under freefall in an external gravitational field should not depend on the external field strength. We test the SEP by investigating the external field effect (EFE) in Milgromian dynamics (MOND), proposed as an alternative to dark matter in interpreting galactic kinematics. We report a detection of this EFE… 

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