A proposed experiment to test gravitational anti-screening and MOND using Sun-Gas giant saddle points

Penner, A. Raymond

doi:10.1007/s10509-020-03870-x

Cited by 9 publications

(14 citation statements)

References 38 publications

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“…This is because the simple interpolating function (Equation ( 15)) preferred by observations [111,141,211,295] implies significant MOND effects in the saddle region, the volume within which g < a 0 . Therefore, spacecraft tests of MOND could aim for the saddle region between a planet and the Sun (for a review, see [858]).…”

Section: Within the Solar Systemmentioning

confidence: 99%

“…The saddle region would extend half as much along the Sun-planet line because the tidal stress is twice as strong this way for an inverse square gravity law. Quantitatively, the Earth-Sun saddle region has a size of only 4.4 m along the Earth-Sun line [858]. This would be crossed very rapidly given the significant orbital velocity of the LISA pathfinder-or indeed any spacecraft at heliocentric distances of r ≈ 1 AU.…”

Section: Within the Solar Systemmentioning

confidence: 99%

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From Galactic Bars to the Hubble Tension: Weighing Up the Astrophysical Evidence for Milgromian Gravity

Banik

Zhao

2022

Symmetry

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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 postulated 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 (LCDM) 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. 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. We also consider several future tests, mostly at scales much smaller than galaxies.

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Section: Within the Solar Systemmentioning

confidence: 99%

Section: Within the Solar Systemmentioning

confidence: 99%

From Galactic Bars to the Hubble Tension: Weighing Up the Astrophysical Evidence for Milgromian Gravity

Banik

Zhao

2022

Symmetry

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“…The saddle region would extend half as much along the Sunplanet line because the tidal stress is twice as strong this way for an inverse square gravity law. Quantitatively, the Earth-Sun saddle region has a size of only 4.4 m along the Earth-Sun line (Penner 2020), which would be crossed very rapidly given the significant orbital velocity of the LISA pathfinder, or indeed any spacecraft at heliocentric distances of r ≈ 1 AU. This severely limits the prospects for a decisive test of gravity in the low-acceleration regime.…”

Section: Within the Solar Systemmentioning

confidence: 99%

“…These difficulties can largely be overcome by considering the saddle point between the Sun and a gas giant planet (Penner 2020). Not only is the Keplerian velocity smaller, the saddle region is also larger because its linear dimensions are ∝ r 3 Mp, where Mp is the planet mass (see his equation 37 and our Equation 71).…”

Section: Within the Solar Systemmentioning

confidence: 99%

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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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Three-body problem in modified dynamics

Shenavar

2023

Celest Mech Dyn Astron

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A proposed experiment to test gravitational anti-screening and MOND using Sun-Gas giant saddle points

Cited by 9 publications

References 38 publications

From Galactic Bars to the Hubble Tension: Weighing Up the Astrophysical Evidence for Milgromian Gravity

From Galactic Bars to the Hubble Tension: Weighing Up the Astrophysical Evidence for Milgromian Gravity

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

Three-body problem in modified dynamics

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