Search Publications

MICROSCOPE Mission: First Constraints on the Violation of the Weak Equivalence Principle by a Light Scalar Dilaton

Bergé, Joel; Pernot-Borràs, Martin; Uzan, Jean-Philippe +3 more

The existence of a light or massive scalar field with a coupling to matter weaker than gravitational strength is a possible source of violation of the weak equivalence principle. We use the first results on the Eötvös parameter by the MICROSCOPE experiment to set new constraints on such scalar fields. For a massive scalar field of mass smaller tha…

Testing the Universality of Free Fall towards Dark Matter with Radio Pulsars

Kramer, Michael; Shao, Lijing; Wex, Norbert

The violation of the weak equivalence principle (EP) in the gravitational field of Earth, described by the Eötvös parameter η_⊕ , was recently constrained to the level |η_⊕| ≲10^-14 by the MICROSCOPE space mission. The Eötvös parameter η_DM, pertaining to the differential couplings of dark matter (DM) and or…