{"paper":{"title":"Space test of the Equivalence Principle: first results of the MICROSCOPE mission","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.IM","physics.space-ph"],"primary_cat":"gr-qc","authors_text":"Alain Robert, Benjamin Pouilloux, Benny Rievers, Bernard Foulon, Bruno Christophe, Claus L\\\"ammerzahl, Damien Boulanger, Emilie Hardy, Fran\\c{c}oise Liorzou, Gilles M\\'etris, Hanns Selig, Hansjoerg Dittus, Isabelle Panet, Joel Berg\\'e, Laura Serron, Manuel Rodrigues, Meike List, Pascale Danto, Pascal Prieur, Phuong-Anh Huynh, Pierre Fayet, Pierre Touboul, Pierre-Yves Guidotti, Pieter Visser, Quentin Baghi, Ratana Chhun, Sandrine Pires, Serge Reynaud, Stefanie Bremer, Thibault Damour, Timothy Sumner, Valerio Cipolla, Vincent Lebat, Yves Andr\\'e","submitted_at":"2019-09-23T20:09:04Z","abstract_excerpt":"The Weak Equivalence Principle (WEP), stating that two bodies of different compositions and/or mass fall at the same rate in a gravitational field (universality of free fall), is at the very foundation of General Relativity. The MICROSCOPE mission aims to test its validity to a precision of $10^{-15}$, two orders of magnitude better than current on-ground tests, by using two masses of different compositions (titanium and platinum alloys) on a quasi-circular trajectory around the Earth. This is realised by measuring the accelerations inferred from the forces required to maintain the two masses "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1909.10598","kind":"arxiv","version":1},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/1909.10598/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"}