The local dark sector

Bergé, Joël; Baudis, L.; Brax, Philippe; Chiow, Sheng‐wey; Christophe, Bruno; Doré, O.; Fayet, Pierre; Hees, A.; Jetzer, Philippe; Lämmerzahl, Cláus; List, Meike; Métris, Gilles; Pernot-Borràs, Martin; Read, Justin I.; Reynaud, Serge; Rhodes, Jason; Rievers, Benny; Rodrigues, Manuel; Sumner, T. J.; Uzan, Jean‐Philippe; Yu, Nan

doi:10.1007/s10686-021-09734-8

Cited by 10 publications

(11 citation statements)

References 117 publications

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“…The deployment of cold atom technologies in space offers unique research opportunities in the fields of fundamental physics, cosmology and astrophysics, as represented in several White Papers submitted to the ESA Voyage 2050 call for mission concepts [4,[6][7][8][9][10][11]. We focus in the following on two of these mission concepts.…”

Section: Scientific Opportunitiesmentioning

confidence: 99%

“…There is also a proposal to probe models of dark energy by deploying a smart constellation of four satellites in an elliptic orbit around the Sun and making orientation-independent measurements of the differential accelerations between each pair of satellites, using as test masses atomic clouds far away from the spacecraft in open-space vacuum (see the Workshop presentation by Nan Yu [194]). It has also been suggested to deploy an atomic clock at a distance O(150) AU to probe the low-acceleration frontier of gravity and the local distribution of dark matter [9]. Another suggestion is to detect the gravito-magnetic field of the galactic dark halo by locating atomic clocks at Sun-Earth Lagrange points and measuring the time-of-flight asymmetries between electromagnetic signals travelling in opposite directions, which would be generated partly by the angular momentum of the Sun and partly by the angular momentum of the dark halo [8].…”

Section: Probes Of General Relativitymentioning

confidence: 99%

“…It built upon one organised two years ago [3], which reviewed the landscape of present and prospective cold atom experiments in space. Subsequently, several White Papers were submitted [4][5][6][7][8][9][10][11][12] in response to the Voyage 2050 call, which outlined possible ultimate goals and reviewed experiments and technical developments underway that could help pave a way towards these goals.…”

mentioning

confidence: 99%

“…The EEP corresponds to the combination of the UFF/WEP with local position invariance and Lorentz invariance. See[208] for a test of Lorentz invariance using MICROSCOPE data 9. See also[212] 10.…”

mentioning

confidence: 99%

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Cold Atoms in Space: Community Workshop Summary and Proposed Road-Map

Alonso,

Alpigiani,

Altschul

et al. 2022

Preprint

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We summarize the discussions at a virtual Community Workshop on Cold Atoms in Space concerning the status of cold atom technologies, the prospective scientific and societal opportunities offered by their deployment in space, and the developments needed before cold atoms could be operated in space. The cold atom technologies discussed include atomic clocks, quantum gravimeters and accelerometers, and atom interferometers. Prospective applications include metrology, geodesy and measurement of terrestrial mass change due to, e.g., climate change, and fundamental science experiments such as tests of the equivalence principle, searches for dark matter, measurements of gravitational waves and tests of quantum mechanics. We review the current status of cold atom technologies and outline the requirements for their space qualification, including the development paths and the corresponding technical milestones, and identifying possible pathfinder missions to pave the way for missions to exploit the full potential of cold atoms in space. Finally, we present a first draft of a possible roadmap for achieving these goals, that we propose for discussion by the interested cold atom, Earth Observation, fundamental physics and other prospective scientific user communities, together with ESA and national space and research funding agencies. research areas. As anticipated for a Europe-based event, about 80% of the registrations are from European countries, as seen in the lower right panel of Fig. 1, but there is also significant North American and Asian participation.This community provides the backbone for long-term planning and the support needed to see the challenging cold atom missions foreseen in the road-map through to their successful completions. The participants display an excellent and diverse mix of expertise, building an outstanding basis for the success of the workshop and the development of the corresponding road-map, which defines possible interim and long-term scientific goals and outlines technological milestones. Section 2 is an introduction to our document, Sections 3 to 5 discuss our main science themes, namely atomic clocks, Earth Observation and fundamental physics, Section 6 discusses the technology developments required before quantum sensors can be deployed in space, Section 7 summarises the discussions during the Workshop, and in Section 8 we outline the corresponding Community road-map.

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Section: Scientific Opportunitiesmentioning

confidence: 99%

Section: Probes Of General Relativitymentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Cold Atoms in Space: Community Workshop Summary and Proposed Road-Map

Alonso,

Alpigiani,

Altschul

et al. 2022

Preprint

Self Cite

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“…Tracking of the spacecraft and/or onboard measurements should give definitive results. One difficulty is that the nearest low-acceleration MOND bubbles of appreciable size are still rather distant, though accurate data from a spacecraft sent out to 150 AU could still be very valuable and would probe lower accelerations than ever before (Bergé et al 2021). Larger distances should eventually be attainable, with the MOND radius (7 kAU) perhaps providing an important intermediate goal on the road to missions that reach other stars.…”

Section: Spacecraft Testsmentioning

confidence: 99%

From galactic bars to the Hubble tension: weighing up the astrophysical evidence for Milgromian gravity

Banik,

Zhao

2021

Preprint

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Astronomical observations reveal a major deficiency in our understanding of physics − the detectable mass is insufficient to explain the observed motions in a huge variety of systems given our current understanding of gravity, Einstein's General theory of Relativity (GR). This missing gravity problem may indicate a breakdown of GR at low accelerations, as posited by Milgromian dynamics (MOND). We review the MOND theory and its consequences, including in a cosmological context where we advocate a hybrid approach involving light sterile neutrinos to address MOND's cluster-scale issues. We then test the novel predictions of MOND using evidence from galaxies, galaxy groups, galaxy clusters, and the large scale structure of the Universe. We also consider whether the standard cosmological paradigm (ΛCDM) can explain the observations, and review several previously published highly significant falsifications of it. Our overall assessment considers both the extent to which the data agree with each theory and how much flexibility each has when accommodating the data, with the gold standard being a clear a priori prediction not informed by the data in question. We also consider some future tests, including on scales much smaller than galaxies. Our conclusion is that MOND is favoured by a wealth of data across a huge range of astrophysical scales, ranging from the kpc scales of galactic bars to the Gpc scale of the local supervoid and the Hubble tension, which is alleviated in MOND through enhanced cosmic variance.

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Testing theories of gravity with planetary ephemerides

Fienga,

Minazzoli

2024

Living Rev Relativ

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We describe here how planetary ephemerides are built in the framework of General Relativity and how they can be used to test alternative theories. We focus on the definition of the reference frame (space and time) in which the planetary ephemeris is described, the equations of motion that govern the orbits of solar system bodies and electromagnetic waves. After a review on the existing planetary and lunar ephemerides, we summarize the results obtained considering full modifications of the ephemeris framework with direct comparisons with the observations of planetary systems, with a specific attention for the PPN formalism. We then discuss other formalisms such as Einstein-dilaton theories, the massless graviton and MOND. The paper finally concludes on some comments and recommendations regarding misinterpreted measurements of the advance of perihelia.

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The local dark sector

Cited by 10 publications

References 117 publications

Cold Atoms in Space: Community Workshop Summary and Proposed Road-Map

Cold Atoms in Space: Community Workshop Summary and Proposed Road-Map

From galactic bars to the Hubble tension: weighing up the astrophysical evidence for Milgromian gravity

Testing theories of gravity with planetary ephemerides

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