Universality of free fall from the orbital motion of a pulsar in a stellar triple system

@article{Archibald2018UniversalityOF,
  title={Universality of free fall from the orbital motion of a pulsar in a stellar triple system},
  author={Anne M. Archibald and Nina Gusinskaia and Jason W. T. Hessels and Adam T. Deller and David L. Kaplan and Duncan R. Lorimer and Ryan S. Lynch and Scott M. Ransom and Ingrid H. Stairs},
  journal={Nature},
  year={2018},
  volume={559},
  pages={73-76}
}
Einstein’s theory of gravity—the general theory of relativity1—is based on the universality of free fall, which specifies that all objects accelerate identically in an external gravitational field. In contrast to almost all alternative theories of gravity2, the strong equivalence principle of general relativity requires universality of free fall to apply even to bodies with strong self-gravity. Direct tests of this principle using Solar System bodies3,4 are limited by the weak self-gravity of… 

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