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arxiv: 1712.01176 · v2 · submitted 2017-12-04 · 🌌 astro-ph.IM · astro-ph.CO· gr-qc

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The MICROSCOPE mission: first results of a space test of the Equivalence Principle

Pierre Touboul , Gilles M\'etris , Manuel Rodrigues , Yves Andr\'e , Quentin Baghi , Joel Berg\'e , Damien Boulanger , Stefanie Bremer
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Patrice Carle Ratana Chhun Bruno Christophe Valerio Cipolla Thibault Damour Pascale Danto Hansjoerg Dittus Pierre Fayet Bernard Foulon Claude Gageant Pierre-Yves Guidotti Daniel Hagedorn Emilie Hardy Phuong-Anh Huynh Henri Inchauspe Patrick Kayser St\'ephanie Lala Claus L\"ammerzahl Vincent Lebat Pierre Leseur Fran\c{c}oise Liorzou Meike List Frank L\"offle Isabelle Panet Benjamin Pouilloux Pascal Prieur Alexandre Rebray Serge Reynaud Benny Rievers Alain Robert Hanns Selig Laura Serron Timothy Sumner Nicolas Tanguy Pieter Visser
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classification 🌌 astro-ph.IM astro-ph.COgr-qc
keywords equivalenceprincipletestfirstforcemathrmmicroscopesame
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According to the Weak Equivalence Principle, all bodies should fall at the same rate in a gravitational field. The MICROSCOPE satellite, launched in April 2016, aims to test its validity at the $10^{-15}$ precision level, by measuring the force required to maintain two test masses (of titanium and platinum alloys) exactly in the same orbit. A non-vanishing result would correspond to a violation of the Equivalence Principle, or to the discovery of a new long-range force. Analysis of the first data gives $\delta\rm{(Ti,Pt)}= [-1 \pm 9 (\mathrm{stat}) \pm 9 (\mathrm{syst})] \times 10^{-15}$ (1$\sigma$ statistical uncertainty) for the titanium-platinum E\"otv\"os parameter characterizing the relative difference in their free-fall accelerations.

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