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Journal Articles Class.Quant.Grav. Year : 2022

Result of the MICROSCOPE weak equivalence principle test

Gilles Métris
Louis Demange
  • Function : Author
Hansjoerg Dittus
  • Function : Author
Daniel Hagedorn
  • Function : Author
Claus Lämmerzahl
  • Function : Author
Meike List
  • Function : Author
Frank Löffler
  • Function : Author
Benny Rievers
  • Function : Author
Hanns Selig
  • Function : Author
Laura Serron
  • Function : Author
Timothy Sumner
  • Function : Author
Pieter Visser
  • Function : Author


The space mission MICROSCOPE dedicated to the test of the equivalence principle (EP) operated from April 25, 2016 until the deactivation of the satellite on October 16, 2018. In this analysis we compare the free-fall accelerations (a$_{A}$ and a$_{B}$) of two test masses in terms of the Eötvös parameter . No EP violation has been detected for two test masses, made from platinum and titanium alloys, in a sequence of 19 segments lasting from 13 to 198 h down to the limit of the statistical error which is smaller than 10$^{−14}$ for η(Ti, Pt). Accumulating data from all segments leads to η(Ti, Pt) = [−1.5 ± 2.3 (stat) ± 1.5 (syst)] × 10$^{−15}$ showing no EP violation at the level of 2.7 × 10$^{−15}$ if we combine stochastic and systematic errors quadratically. This represents an improvement of almost two orders of magnitude with respect to the previous best such test performed by the Eöt-Wash group. The reliability of this limit has been verified by comparing the free falls of two test masses of the same composition (platinum) leading to a null Eötvös parameter with a statistical uncertainty of 1.1 × 10$^{−15}$.
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Dates and versions

hal-03781319 , version 1 (22-09-2022)



Pierre Touboul, Gilles Métris, Manuel Rodrigues, Joel Bergé, Alain Robert, et al.. Result of the MICROSCOPE weak equivalence principle test. Class.Quant.Grav., 2022, 39 (20), pp.204009. ⟨10.1088/1361-6382/ac84be⟩. ⟨hal-03781319⟩
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