Testing Fifth Forces from the Galactic Dark Matter

Lijing Shao

doi:10.3390/proceedings2019017003

Kavli Institute for Astronomy and Astrophysics, Peking University, Beijing 100871, China

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Presented at the meeting Recent Progress in Relativistic Astrophysics, Shanghai, China, 6–8 May 2019.

Proceedings2019, 17(1), 3;https://doi.org/10.3390/proceedings2019017003

This article belongs to the Proceedings Recent Progress in Relativistic Astrophysics

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Abstract

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

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Testing Fifth Forces from the Galactic Dark Matter †

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Testing Fifth Forces from the Galactic Dark Matter ^†