Exploring the foundations of the physical universe with space tests of the equivalence principle

Baptiste Battelier*, Joël Bergé, Andrea Bertoldi, Luc Blanchet, Kai Bongs, Philippe Bouyer, Claus Braxmaier, Davide Calonico, Pierre Fayet, Naceur Gaaloul, Christine Guerlin, Aurélien Hees, Philippe Jetzer, Claus Lämmerzahl, Steve Lecomte, Christophe Le Poncin-Lafitte, Sina Loriani, Gilles Métris, Miquel Nofrarias, Ernst RaselSerge Reynaud, Manuel Rodrigues, Markus Rothacher, Albert Roura, Christophe Salomon, Stephan Schiller, Wolfgang P. Schleich, Christian Schubert, Carlos F. Sopuerta, Fiodor Sorrentino, Timothy J. Sumner, Guglielmo M. Tino, Philip Tuckey, Wolf von Klitzing, Lisa Wörner, Peter Wolf, Martin Zelan

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)
13 Downloads (Pure)


We present the scientific motivation for future space tests of the equivalence principle, and in particular the universality of free fall, at the 10− 17 level or better. Two possible mission scenarios, one based on quantum technologies, the other on electrostatic accelerometers, that could reach that goal are briefly discussed. This publication is a White Paper written in the context of the Voyage 2050 ESA Call for White Papers.

Original languageEnglish
Pages (from-to)1695-1736
Number of pages42
JournalExperimental Astronomy
Issue number3
Publication statusPublished - 7 Sept 2021

Bibliographical note

Publisher Copyright:
© 2021, The Author(s).


  • Electrostatic accelerometers
  • Equivalence principle
  • Quantum technologies

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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