On planetary orbits in entropic gravity

Pérez-Cuéllar, G.; Sabido, M.

doi:10.1142/s0217732321500504

Cited by 4 publications

(2 citation statements)

References 29 publications

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“…This is consistent with the MOND prediction of 4, but by now it is quite clear that M s ∝ v f 2 is strongly incompatible with observations, a fact which has been known for many decades [159]. This also rules out volume corrections to the Hawking-Bekenstein entropy relation as a cause for the missing gravity problem [358]. Figure 12.…”

Section: Implications For Alternatives To λCdm and Mondsupporting

confidence: 79%

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: Implications For Alternatives To λCdm and Mondsupporting

confidence: 79%

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

Banik

Zhao

2022

Symmetry

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“…As presented in [6], we can obtain corrections to Newtonian gravity from a non-extensive entropy. Also in [7], the consequences on planetary motion were studied. Since these formulations of gravity have an entropic origin, in principle, one can propose modifications to gravity by analyzing changes to the entropy area law.…”

Section: Introductionmentioning

confidence: 99%

Cosmology and Non-additive Entropy

Martínez-Merino¹,

Sabido²

2022

Preprint

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Non-additive entropies have been proposed as alternatives to understanding the thermodynamics of Black Holes. Moreover, it has been suggested that the difficulties of quantization of gravity are an indication that gravity is an emergent phenomenon, and therefore an entropic formulation is warranted. In this work, we explore cosmologies that come from non-additive entropies. We focus our study on the cosmologies derived from entropies in superstatistics.

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On the entropy of a stealth vector-tensor black hole

Chagoya,

Díaz-Saldaña,

López-Domínguez

et al. 2024

Eur. Phys. J. C

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We apply Wald’s formalism to a Lagrangian within generalised Proca gravity that admits a Schwarzschild black hole with a non-trivial vector field. The resulting entropy differs from that of the same black hole in General Relativity by a logarithmic correction modulated by the only independent charge of the vector field. We find conditions on this charge to guarantee that the entropy is a non-decreasing function of the black hole area, as is the case in GR. If this requirement is extended to black hole mergers, we find that for Planck scale black holes, a non-decreasing entropy is possible only if the area of the final black hole is several times larger than the initial total area of the merger. Finally, we discuss some implications of the vector Galileon entropy from the point of view of entropic gravity.

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On planetary orbits in entropic gravity

Cited by 4 publications

References 29 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

Cosmology and Non-additive Entropy

On the entropy of a stealth vector-tensor black hole

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