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Open AccessProceedings

Testing Fifth Forces from the Galactic Dark Matter

Kavli Institute for Astronomy and Astrophysics, Peking University, Beijing 100871, China
Presented at the meeting Recent Progress in Relativistic Astrophysics, Shanghai, China, 6–8 May 2019.
Proceedings 2019, 17(1), 3;
Published: 5 July 2019
(This article belongs to the Proceedings of Recent Progress in Relativistic Astrophysics)
PDF [245 KB, uploaded 5 July 2019]


Is there an unknown long-range force between dark matter (DM) and ordinary matters? When such a fifth force exists and in the case that it is ignored, the equivalence principle (EP) is violated apparently. The violation of EP was severely constrained by, for examples, the Eöt–Wash laboratory experiments, the lunar laser ranging, the MICROSCOPE satellite, and the long-term observation of binary pulsars. We discuss a recent bound that comes from PSR J1713+0747. When it is combined with the other bounds, a compelling limit on the hypothetical fifth force is derived. For the neutral hydrogen, the strength of such a fifth force should not exceed 1 % of the gravity.
Keywords: dark matter; equivalence principle; binary pulsars dark matter; equivalence principle; binary pulsars
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Shao, L. Testing Fifth Forces from the Galactic Dark Matter . Proceedings 2019, 17, 3.

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