Covariant version of Verlinde’s emergent gravity

Hossenfelder, Sabine

doi:10.1103/physrevd.95.124018

Cited by 64 publications

(113 citation statements)

References 30 publications

(56 reference statements)

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“…Although technical differences are small, the latter interpretation is believed to provide an improved conceptual understanding of emergent quantum gravity in terms of space-time's micro-constituents and the fundamental degrees of freedom at their availability. Further entropic gravity generalizations by Padmanabhan [9] and Verlinde [10] still hold true, while a covariant Lagrangian version has been provided by Hossenfelder [30]. Relating the micro-constituent-based interpretation of entropic gravity as presented here to promising studies in entropic cosmology [31][32][33][34][35] is subject of ongoing research.…”

Section: Entropic Gravitymentioning

confidence: 71%

“…In line with the common interpretation of Einstein's field equations, one could indeed imagine that a composite body (i.e., a space-time constituent collection) experiencing no net force whatsoever must be located within an isotropic space-time constituent density distribution, while every "force" that disturbs the isotropy, as a "space-time curvature" effect on the surrounding micro-constituent density distribution, is compensated for by a macroscopic acceleration, as effectively induced by a sub-quantum micro-constituent dynamics according to Equation (30), to a geodesic trajectory. This view corresponds with the idea that according to general relativity gravity is not a force in the classical sense as objects do not couple to the gravitational field; objects just exist and, if not differently constrained, follow geodesic trajectories [36].…”

Section: Discussionmentioning

confidence: 99%

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What Constitutes Emergent Quantum Reality? A Complex System Exploration from Entropic Gravity and the Universal Constants

Keppens¹

2018

Entropy

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Abstract:In this work, it is acknowledged that important attempts to devise an emergent quantum (gravity) theory require space-time to be discretized at the Planck scale. It is therefore conjectured that reality is identical to a sub-quantum dynamics of ontological micro-constituents that are connected by a single interaction law. To arrive at a complex system-based toy-model identification of these micro-constituents, two strategies are combined. First, by seeing gravity as an entropic phenomenon and generalizing the dimensional reduction of the associated holographic principle, the universal constants of free space are related to assumed attributes of the micro-constituents. Second, as the effective field dynamics of the micro-constituents must eventually obey Einstein's field equations, a sub-quantum interaction law is derived from a solution of these equations. A Planck-scale origin for thermodynamic black hole characteristics and novel views on entropic gravity theory result from this approach, which eventually provides a different view on quantum gravity and its unification with the fundamental forces.

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Section: Entropic Gravitymentioning

confidence: 71%

Section: Discussionmentioning

confidence: 99%

What Constitutes Emergent Quantum Reality? A Complex System Exploration from Entropic Gravity and the Universal Constants

Keppens¹

2018

Entropy

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“…Hossenfelder's generally covariant vector-field version of Verlinde's emergent gravity concept [3] provides a model for "dark matter" phenomena, DM Φ , which I attribute through equivalence to "enlightened matter", M Ξ Φ . Through this equivalence, it is proposed that her vector-field, u, is the Epistemic Field [24] and that gradients in the field cause Epistemic Drive, as discussed in the author's research programme on Quantum Intelligent Cosmology.…”

Section: Discussionmentioning

confidence: 99%

“…Entropic gravity theories [1] [2] [3] offer possible explanations, without recourse to unseen "dark matter" particles. These theories invite probing of their foundations.…”

Section: Introductionmentioning

confidence: 99%

Agency of Life, Entropic Gravity and Phenomena Attributed to “Dark Matter”

McCoss¹

2017

JQIS

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Entropic gravity theories propose that spacetime and gravity emerge from quantum information entanglements. Vacuum spacetime emerges in the ground state and its area law for entanglement entropy is due to short-range entanglement of neighbouring microscopic degrees of freedom. Matter changes the entanglement entropy in this vacuum and leads to Einstein gravity. Additionally, in a positive dark energy de Sitter Universe, where each conscious agent has a cosmological horizon, a volume law contribution to entanglement entropy is divided evenly over the same degrees of freedom and is caused by long-range entanglement. I propose these complementary shortrange and long-range entanglement contributions form a nested small-world network which provides the topological quantum computing foundation for relativistic multi-agent correlations which weave together a universal physics of Nature. The volume law contribution to entanglement entropy surpasses the area law for entanglement entropy at an agent's cosmological horizon. Verlinde interprets gravitational "dark matter" phenomena as polymer-like memory effects caused by the volume contribution to the entanglement entropy. I propose these phenomena are instead multi-agent quantum computational consensus effects due to an equivalent volume contribution to the entanglement entropy. Life is correlated with its environment. Phenomena attributed to unseen "dark matter" particles are proposed here to be founded upon nested observer halos, "spheres of influence or correlation", caused by the consensus Agency of Life. Suitable cosmological conditions for earliest Life in the Universe occurred some 10 billion years ago and older galaxies do not exhibit "dark matter" phenomena. Also, galactic rotation curves flatten beyond their high-radiation centres, due to astrobiology and the Agency of Life living in outlying low-radiation habitable zones. Where baryonic matter is in motion, then the Agency of Life stores its baryonic matter-lagging memory in skewed trails of apparent "dark matter" phenomena in spacetime.

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“…Since this extra field couples to baryons, it must couple at least indirectly to photons too. Most often, a direct coupling of this additional field to photons is not included [1,2,[14][15][16][17][18], or if it is included the magnitude of the coupling is not specified [3]. Such a non-geometric effect on the photon's path would modify the galactic gravitational lensing signature, and could directly provide a constraint on these models.…”

Section: Pacs Numbersmentioning

confidence: 99%

Strong lensing constraints on modified gravity models

2018

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We impose the first strong-lensing constraints on a wide class of modified gravity models where an extra field that modifies gravity also couples to photons (either directly or indirectly through a coupling with baryons) and thus modifies lensing. We use the nonsingular isothermal ellipsoid (NIE) profile as an effective potential which produces flat galactic rotation curves. If a concrete modified gravity model gives a flat rotation curve, then the parameter Γ that characterizes the lensing effect must take some definite value. We find that Γ = 1.24 ± 0.65 at 1σ, consistent with general relativity (Γ = 1). This constrains the parameter space in some recently proposed models. PACS numbers:Astrophysical observations on scales greater than the solar system do not match predictions from standard gravity sourced by ordinary matter. On the scales of galaxies and clusters of galaxies the problem might be resolved if we postulate the existence of particle dark matter. However, the persistent null results from direct and indirect searches for particle dark matter strengthen the case to seriously explore alternative explanations. Those include alternative dark matter candidates such as primordial black holes and macros, but also the possibility that General Relativity must be altered.The principal alternative gravity framework, MOND, has been around for decades as a phenomenological fit [1]. More recently concrete dynamical models with well defined relativistic Lagrangians have emerged[2]. By construction, such models reproduce flat galactic rotation curves, however, as hinted in [3], so far it has not been considered whether these models can pass the strong lensing test on galactic scales.General relativity has been tested to high precision on the solar system scale. Recently such tests have been also extended to galactic scales [4][5][6][7]. These tests mainly focus on testing the post Newtonian parameters, in particular γ, which is the leading order term. The geometric metric in the post-post-Newtonian form can be written aswhere we have included only the leading-order terms.

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Covariant version of Verlinde’s emergent gravity

Cited by 64 publications

References 30 publications

What Constitutes Emergent Quantum Reality? A Complex System Exploration from Entropic Gravity and the Universal Constants

What Constitutes Emergent Quantum Reality? A Complex System Exploration from Entropic Gravity and the Universal Constants

Agency of Life, Entropic Gravity and Phenomena Attributed to “Dark Matter”

Strong lensing constraints on modified gravity models

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