Gravitational Redshift Test Using Eccentric Galileo Satellites
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We report on a new test of the gravitational redshift and thus of local position invariance, an integral part of the Einstein equivalence principle, which is the foundation of general relativity and all metric theories of gravitation. We use data spanning 1008 days from two satellites of Galileo, Europe's global satellite navigation system, which were launched in 2014, but accidentally delivered on elliptic rather than circular orbits. The resulting modulation of the gravitational redshift of the onboard atomic clocks allows the redshift determination with high accuracy. Additionally, specific laser ranging campaigns to the two satellites have enabled a good estimation of systematic effects related to orbit uncertainties. Together with a careful conservative modeling and control of other systematic effects we measure the fractional deviation of the gravitational redshift from the prediction by general relativity to be (0.19±2.48)×10^{-5} at 1 sigma, improving the best previous test by a factor 5.6. To our knowledge, this represents the first reported improvement on one of the longest standing results in experimental gravitation, the Gravity Probe A hydrogen maser rocket experiment back in 1976.
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The redshift parameter c is constrained at the 10^-5 level.
“The parameter is constrained at the 10 À5 level (Delva et al. 2018;Herrmann et al. 2018).”
From Fundamental constants: from measurement to the universe, a window on gravitation and cosmology (2025) · cites this paper as Delva et al. 2018
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- Authors
- Delva, P., Puchades, N., Schönemann, E., Dilssner, F., Courde, C., Bertone, S., Gonzalez, F., Hees, A., Le Poncin-Lafitte, C., Meynadier, F., Prieto-Cerdeira, R., Sohet, B., Ventura-Traveset, J., & Wolf, P.
- Affiliations
- Centre National de la Recherche Scientifique (FR)
- European Space Operations Centre (DE)
- Observatoire de la Côte d’Azur (FR)
- University of Bern (CH)
- European Space Research and Technology Centre (NL)
- Venue
- Physical Review Letters
- Publisher
- American Physical Society (APS)
- Published
- 2018-12-04
- Volume
- 121
- Issue
- 23
- Pages
- 231101-231101
- ISSN
- 0031-9007 (ISSN-L)
- 1079-7114
- OpenAlex
- W2903259321
- Cited by
- 210
- References
- 37
- Citations by year
- 2026: 16 · 2025: 21 · 2024: 39 · 2023: 32 · 2022: 32 · 2021: 19 · 2020: 28 · 2019: 22 · 2018: 1
- FWCI
- 9.42
- Type
- journal article
- Language
- en
- Open access
- bronze
- doi.org
- Locations
- Physical Review Letters (publishedVersion)
- PubMed (publishedVersion)
- arXiv (Cornell University) (submittedVersion)
- HAL (submittedVersion, other-oa)
- arXiv (Cornell University)
- Funders
- European Space Agency
- Generalitat Valenciana (APOSTD2017)
- Observatoire de Paris
- Topics
- Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Relativity and Gravitational Theory
- Physical Sciences › Physics and Astronomy › Atomic and Molecular Physics, and Optics › Advanced Frequency and Time Standards
- Physical Sciences › Engineering › Aerospace Engineering › GNSS positioning and interference
- Keywords
- gravitational redshift, local position invariance, Einstein equivalence principle, Galileo satellites, eccentric orbits, onboard atomic clocks, laser ranging, orbit uncertainty, tests of general relativity
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