Testing the Einstein equivalence principle with two Earth-orbiting clocks

Litvinov, D. A.; Пилипенко, С. В.

doi:10.1088/1361-6382/abf895

Cited by 10 publications

(8 citation statements)

References 21 publications

(43 reference statements)

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“…We note that variations of such experiments with optical clocks in space have been proposed, e.g. Altschul et al (2015), Litvinov and Pilipenko (2021).…”

Section: Testing Gr and The Standard Model Of Physics With Atomic Clocksmentioning

confidence: 98%

Fundamental physics with a state-of-the-art optical clock in space

Derevianko

Gibble

Hollberg

et al. 2022

Quantum Sci. Technol.

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Recent advances in optical atomic clocks and optical time transfer have enabled new possibilities in precision metrology for both tests of fundamental physics and timing applications. Here we describe a space mission concept that would place a state-of-the-art optical atomic clock in an eccentric orbit around Earth. A high stability laser link would connect the relative time, range, and velocity of the orbiting spacecraft to earthbound stations. The primary goal for this mission would be to test the gravitational redshift, a classical test of general relativity, with a sensitivity 30,000 times beyond current limits. Additional science objectives include other tests of relativity, enhanced searches for dark matter and drifts in fundamental constants, and establishing a high accuracy international time/geodesic reference.

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“…We note that variations of such experiments with optical clocks in space have been proposed, e.g. Altschul et al (2015), Litvinov and Pilipenko (2021).…”

Section: Testing Gr and The Standard Model Of Physics With Atomic Clocksmentioning

confidence: 98%

Fundamental physics with a state-of-the-art optical clock in space

Derevianko

Gibble

Hollberg

et al. 2022

Quantum Sci. Technol.

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“…Our present proposal does not require an optical link enabling comparing the satellite and Earth-based clocks. If such a link can be achieved, one can also directly test general relativity and provide a direct bound on the anomalous gravitational redshift exceeding present bounds by orders of magnitude [103][104][105].…”

Section: Spatial Variation Of Fundamental Constantsmentioning

confidence: 99%

“…In the lower panel, we observe that even a very small bound mass, of order 10 −16 M , can give rise to a 10 4 increase in the density of DM at 0.1 AU for m φ 10 −13 eV. It has been proposed to put atomic clocks in orbit around the Earth [104,105] and on the moon (see e.g. [110]).…”

mentioning

confidence: 94%

SpaceQ -- Direct Detection of Ultralight Dark Matter with Space Quantum Sensors

Tsai¹,

Eby²,

Safronova³

2021

Preprint

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Recent advances in quantum sensors, including atomic clocks, enable searches for a broad range of dark matter candidates. The question of the dark matter distribution in the Solar system critically affects the reach of dark matter direct detection experiments. Partly motivated by the NASA Deep Space Atomic Clock (DSAC), we show that space quantum sensors present new opportunities for ultralight dark matter searches, especially for dark matter states bound to the Sun. We show that space quantum sensors can probe unexplored parameter space of ultralight dark matter, covering theoretical relaxion targets motivated by naturalness and Higgs mixing. If an atomic clock were able to make measurements on the interior of the solar system, it could probe this highly sensitive region directly and set very strong constraints on the existence of such a bound-state halo in our solar system. We present sensitivity projections for space-based probes of ultralight dark matter which couples to electron, photon, and gluon fields, based on current and future atomic, molecular, and nuclear clocks.

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“…Finally, VLBI requires highly stable atomic frequency standards to be used at each of the participating radio telescope, including those in space, to coherently time-tag the signals received from astronomical sources. Those frequency standards not only provide time and frequency reference signals for the on-board electronic equipment but also are usually used to synchronize downlink signal frequencies, which provides for performing high-accuracy radio science experiments with space-VLBI SC (Biriukov et al, 2014;Litvinov et al, 2018;Nunes et al, 2020;Gurvits, 2020;Litvinov & Pilipenko, 2021). Therefore, to evaluate the significance of the changes we introduced to the APCM effect model we apply it to the case of the RadioAstron spacecraft (Kardashev et al, 2013) and the NRAO140 antenna of the Green Bank Earth Station (Ford et al, 2014) which served the RadioAstron SVLBI mission.…”

Section: Introductionmentioning

confidence: 99%

The antenna phase center motion effect in high-accuracy spacecraft tracking experiments

Litvinov,

Nunes,

Filetkin

et al. 2021

Preprint

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We present an improved model for the antenna phase center motion effect for high-gain mechanically steerable ground-based and spacecraft-mounted antennas that takes into account non-perfect antenna pointing. Using tracking data of the RadioAstron spacecraft we show that our model can result in a correction of the computed value of the effect of up to 2 × 10 −14 in terms of the fractional frequency shift, which is significant for high-accuracy spacecraft tracking experiments. The total fractional frequency shift due to the phase center motion effect can exceed 1 × 10 −11 both for the ground and space antennas depending on the spacecraft orbit and antenna parameters. We also analyze the error in the computed value of the effect and find that it can be as large as 4 × 10 −14 due to uncertainties in the spacecraft antenna axis position, ground antenna axis offset and misalignment, and others. Finally, we present a way to reduce both the ground and space antenna phase center motion effects by several orders of magnitude, e.g. for RadioAstron to below 1 × 10 −16 , by tracking the spacecraft simultaneously in the one-way downlink and two-way phase-locked loop modes, i.e. using the Gravity Probe A configuration of the communications links.

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Testing the Einstein equivalence principle with two Earth-orbiting clocks

Cited by 10 publications

References 21 publications

Fundamental physics with a state-of-the-art optical clock in space

Fundamental physics with a state-of-the-art optical clock in space

SpaceQ -- Direct Detection of Ultralight Dark Matter with Space Quantum Sensors

The antenna phase center motion effect in high-accuracy spacecraft tracking experiments

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