A new test of gravitational redshift using Galileo satellites: The GREAT experiment |
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| Institution: | 1. SYRTE, Observatoire de Paris, Université PSL, CNRS, Sorbonne Université, LNE, 61, avenue de l''Observatoire, 75014 Paris, France;2. Departamento de Astronomía y Astrofísica, Edificio de Investigación Jerónimo Muñoz, C/Dr. Moliner, 50, 46100 Burjassot (Valencia), Spain;3. European Space Operations Center, ESA/ESOC, Darmstadt, Germany;4. UMR Geoazur, Université de Nice, Observatoire de la Côte d''Azur, 250, rue Albert-Einstein, 06560 Valbonne, France;5. Astronomical Institute, University of Bern, Sidlerstrasse 5, CH-3012 Bern, Switzerland;6. European Space and Technology Centre, ESA/ESTEC, Noordwijk, The Netherlands;7. European Space and Astronomy Center, ESA/ESAC, Villanueva de la Cañada, Spain |
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| Abstract: | We present the result of the analysis of the GREAT (Galileo gravitational Redshift test with Eccentric sATellites) experiment. An elliptic orbit induces a periodic modulation of the fractional frequency difference between a ground clock and the satellite clock, partly due to the gravitational redshift, while the good stability of Galileo clocks allows one to test this periodic modulation to a high level of accuracy. GSAT0201 and GSAT0202, with their large eccentricity and on-board H-maser clocks, are perfect candidates to perform this test. Satellite laser ranging data allows us to partly decorrelate the orbit perturbations from the clock errors. By analyzing several years of Galileo tracking data, we have been able to improve the Gravity probe A test (1976) of the gravitational redshift by a factor of 5.6, providing, to our knowledge, the first reported improvement since more than 40 years. |
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| Keywords: | GNSS Galileo General Relativity Gravitational Redshift Equivalence Principle GNSS Galileo Relativité Générale Décalage Gravitationnel vers le rouge Principe d'Équivalence |
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