Gravitational redshift test with the future ACES mission

Savalle, Etienne; Guerlin, Christine; Delva, Pacôme; Meynadier, Frédéric; Poncin-Lafitte, Christophe Le; Wolf, Peter

doi:10.1088/1361-6382/ab4f25

Cited by 33 publications

(23 citation statements)

References 35 publications

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“…Fig. 5 Gravitational redshift model over one day for phase data (top) and for frequency (bottom) data, with on the right-hand axis the range between the ISS and the GS (Savalle et al 2019).…”

Section: Gravitational Redshiftmentioning

confidence: 99%

“…In addition to the data simulation software designed to reproduce realistic ACES observables and the data processing software designed to compute desynchronization data from those observables, both described in the section above, we have developed independent software that models desynchronization data and determines from the data (Savalle et al 2019):…”

Section: Scientific Data Analysis Softwarementioning

confidence: 99%

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ACES/PHARAO: high-performance space-to-ground and ground-to-ground clock comparison for fundamental physics

et al. 2021

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The Atomic Clock Ensemble in Space (ACES) is a fundamental physics mission of the European Space Agency (ESA) to be launched in August 2021. It relies on a high-performance clock onboard the International Space Station (ISS), a network of high-performance clocks on ground, a dedicated two-way microwave link (MWL) enabling space-to-ground and groundto-ground clock comparisons, as well as an optical link (ELT). PHARAO/SHM (Projet d'Horloge Atomique par Refroidissement d'Atomes en Orbite/Space Hydrogen Maser), the clock onboard the ISS, has a relative frequency accuracy at the 10 !"# level, a relative frequency stability (Allan deviation) equal to 10 !"$ √ ⁄ ( being the integration time in seconds) and a time deviation of 12 picoseconds after one day of integration. The MWL is designed to reach a time deviation below 7 ps after one day of integration. While space-to-ground clock comparisons will enable precise tests of the gravitational redshift, tests of deviations fromGeneral Relativity at the 10 !# level, and tests of local Lorentz invariance at the 10 !"% level, ground-to-ground clock comparisons will enable a search of the time variation of fundamental constants with uncertainty at the 10 !"& level after one year. In this contribution, we review the mission set up with a particular emphasis on the MWL, discuss the simulation and data analysis software developed to investigate mission performance, focusing on its primary scientific objective: the test of the gravitational redshift.

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Section: Gravitational Redshiftmentioning

confidence: 99%

Section: Scientific Data Analysis Softwarementioning

confidence: 99%

ACES/PHARAO: high-performance space-to-ground and ground-to-ground clock comparison for fundamental physics

et al. 2021

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“…Phase (and frequency) transfers are standard methods in high frequency RF communications and have been demonstrated on satellite links with a performance of 10 −15 [54] with the same fundamental limitations imposed by the frequency used for the transfer. These technologies are about to be demonstrated at increased accuracy in space in ESA's International Space Station-based Atomic Clock Ensemble in Space (ACES) project, which contains both frequency standards and transfer capabilities to ground [55]. ACES is currently scheduled to launch in mid-2021 [56].…”

Section: Time Standards and Frequency Transfer-based Applicationsmentioning

confidence: 99%

Quantum Technologies for Space

2018

Space Research Today

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Recently, the European Commission supported by many European countries has announced large investments towards the commercialization of quantum technology (QT) to address and mitigate some of the biggest challenges facing today's digital erae.g. secure communication and computing power. For more than two decades the QT community has been working on the development of QTs, which promise landmark breakthroughs leading to commercialization in various areas. The ambitious goals of the QT community and expectations of EU authorities cannot be met solely by individual initiatives of single countries, and therefore, require a combined European effort of large and unprecedented dimensions comparable only to the Galileo or Copernicus programs. Strong international competition calls for a coordinated European effort towards the development of QT in and for space, including research and development of technology in the areas of communication and sensing. Here, we aim at summarizing the state of the art in the development of quantum technologies which have an impact in the field of space applications. Our goal is to outline a complete framework for the design, development, implementation, and exploitation of quantum technology in space.

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“…Concerning the ACES mission, some studies have addressed the test of GRS based on time comparison [17,21,22], but there are few publications related to the frequency comparison. Frequency links and comparisons will be available on CSS mission.…”

Section: Introductionmentioning

confidence: 99%

Test of gravitational red-shift based on tri-frequency combination of microwave frequency links

Sun

Shen

et al. 2021

Eur. Phys. J. C

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Over the decades, testing gravitational red-shift (GRS) based on microwave links has made great process, including the GPA experiment, the planned Atomic Clock Ensemble in Space mission, and the China Space Station (CSS). Until now, the formulations of microwave links are almost all based on the time comparison. However, there are advantages of using frequency comparison instead of time comparison to test GRS. Here we develop a tri-frequency combination method based on the measurements of the frequency shifts of three independent microwave links between a space station and a ground station. Aiming at the frequency links’ accuracy of $$3\times 10^{-16}$$ 3 × 10 - 16 , we should consider various effects, including the Doppler effect, second-order Doppler effect, atmospheric frequency shift, tidal effects, refraction caused by the atmosphere, and Shapiro effect, with accuracy levels of tens of centimeters. The CSS will complete construction in 2022, and the formulation proposed in this study will enable us to test GRS at an accuracy level of at least $$2\times 10^{-6}$$ 2 × 10 - 6 , which is one order higher than the present accuracy level of $$7\times 10^{-5}$$ 7 × 10 - 5 .

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Gravitational redshift test with the future ACES mission

Cited by 33 publications

References 35 publications

ACES/PHARAO: high-performance space-to-ground and ground-to-ground clock comparison for fundamental physics

ACES/PHARAO: high-performance space-to-ground and ground-to-ground clock comparison for fundamental physics

Quantum Technologies for Space

Test of gravitational red-shift based on tri-frequency combination of microwave frequency links

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