Presence of a Fundamental Acceleration Scale in Galaxy Clusters

Edmonds, Douglas; Minic, Djordje; Takeuchi, Tatsu

doi:10.48550/arxiv.2009.12915

Cited by 4 publications

(5 citation statements)

References 70 publications

(85 reference statements)

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“…Also, our results give a larger value of the 'acceleration scale' (if it exists) for the central RAR in galaxy clusters compared with the galactic RAR. These results are consistent with other recent studies of the RAR in galaxy clusters [18][19][20][21].…”

Section: Discussionsupporting

confidence: 94%

“…However, whether a tight RAR could also be found in galaxy clusters is quite controversial. Some studies show that the functional form of the RAR in galaxies might still be true for galaxy clusters, although the acceleration scale value is different from that in galaxies [18,19]. Some other studies show that the scatter of the RAR in galaxy clusters is too large to be consistent with that in galaxies [20][21][22].…”

Section: Introductionmentioning

confidence: 99%

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The analytic radial acceleration relation for galaxy clusters

Chan,

Law

2022

Preprint

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Recently, a tight correlation between the dynamical radial acceleration and the baryonic radial acceleration in galaxies -the radial acceleration relation -has been discovered. This has been claimed as an indirect support of the modified gravity theories. However, whether the radial acceleration relation could also be found in galaxy clusters is controversial. In this article, we derive and present an analytic radial acceleration relation for the central region of galaxy clusters. We examine the data of some large galaxy clusters and we find that the resulting radial acceleration relation has a very large scatter. Moreover, although the radial acceleration relation for galaxy clusters shows some agreement with the one discovered in galaxies for a certain range of baryonic radial acceleration, their functional forms are somewhat different from each other. This suggests that the radial acceleration relation may not be a universal relation in general.

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Section: Discussionsupporting

confidence: 94%

Section: Introductionmentioning

confidence: 99%

The analytic radial acceleration relation for galaxy clusters

Chan,

Law

2022

Preprint

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“…are all analyzed together, the preferred power is n = 4, though the data does show considerable scatter around this line. 52,55,56 Furthermore, the slope of the n = 4 BFJ fit again gives the fundamental acceleration σ 4 /(GM bar ) ∼ 10 −10 m/s 2 .…”

Section: Observational Issuesmentioning

confidence: 89%

On Quantum Gravity and Quantum Gravity Phenomenology

Edmonds¹,

Minić²,

Takeuchi³

2021

Preprint

Self Cite

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This article summarizes a new approach to quantum gravity based on the concepts of modular spacetime, Born geometry, and metastring theory and their applications to quantum gravity phenomenology. In particular, we discuss a new understanding of dark matter in terms of metaparticles (zero modes of the metastring) and its relation to dark energy (the curvature of dual spacetime) in view of the actual astronomical observations.

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“…A debate about the existence or the absence of a universal a 0 is presented in [66]. Another study sees the emergence of an acceleration scale consistent with a 0 , besides from the BTFR, built from rotationallysupported galaxies, from the baryonic Faber-Jackson relation built from pressure-supported galaxies, such as elliptical galaxies and GCs, and from the baryonic Faber-Jackson relation built from galaxy clusters ( [67] and references). The fact that the same acceleration scale also emerges from the dynamics of galaxy clusters, which are different from galaxies both in terms of scale and evolutionary histories, might pose an even more severe issue for ΛCDM.…”

Section: Description Of the Three Relationsmentioning

confidence: 99%

Dark Coincidences: Small-Scale Solutions with Refracted Gravity and MOND

Cesare

2023

Universe

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General relativity and its Newtonian weak field limit are not sufficient to explain the observed phenomenology in the Universe, from the formation of large-scale structures to the dynamics of galaxies, with the only presence of baryonic matter. The most investigated cosmological model, the ΛCDM, accounts for the majority of observations by introducing two dark components, dark energy and dark matter, which represent ∼95% of the mass-energy budget of the Universe. Nevertheless, the ΛCDM model faces important challenges on the scale of galaxies. For example, some very tight relations between the properties of dark and baryonic matters in disk galaxies, such as the baryonic Tully–Fisher relation (BTFR), the mass discrepancy–acceleration relation (MDAR), and the radial acceleration relation (RAR), which see the emergence of the acceleration scale a0≃1.2×10−10 m s−2, cannot be intuitively explained by the CDM paradigm, where cosmic structures form through a stochastic merging process. An even more outstanding coincidence is due to the fact that the acceleration scale a0, emerging from galaxy dynamics, also seems to be related to the cosmological constant Λ. Another challenge is provided by dwarf galaxies, which are darker than what is expected in their innermost regions. These pieces of evidence can be more naturally explained, or sometimes even predicted, by modified theories of gravity, that do not introduce any dark fluid. I illustrate possible solutions to these problems with the modified theory of gravity MOND, which departs from Newtonian gravity for accelerations smaller than a0, and with Refracted Gravity, a novel classical theory of gravity introduced in 2016, where the modification of the law of gravity is instead regulated by a density scale.

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Presence of a Fundamental Acceleration Scale in Galaxy Clusters

Cited by 4 publications

References 70 publications

The analytic radial acceleration relation for galaxy clusters

The analytic radial acceleration relation for galaxy clusters

On Quantum Gravity and Quantum Gravity Phenomenology

Dark Coincidences: Small-Scale Solutions with Refracted Gravity and MOND

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