Compare · The Nature of Space & Time

Holographic Spacetime vs Verlinde Entropic Gravity

Emergent Spacetime & Gravity· within family

	Holographic Spacetime Frontier	Verlinde Entropic Gravity Frontier
Proposed	1997 / 2010	2011 / 2017
Key figures	Juan Maldacena, Mark Van Raamsdonk, Shinsei Ryu, Tadashi Takayanagi, Leonard Susskind	Erik Verlinde
In one sentence	Spacetime geometry emerges from quantum entanglement in a lower-dimensional theory without gravity, as established by AdS/CFT in anti-de Sitter space. Whether this generalizes to our de Sitter universe is an open question.	Verlinde proposed that gravity is not a fundamental force but an entropic effect arising from changes in information on holographic screens. The 2016 extension to dark matter has been substantially constrained by 2017-2019 weak-lensing and radial-acceleration-relation tests.
Predictions	AdS/CFT predicts precise relationships between strongly coupled QFT correlators (e.g., quark-gluon plasma viscosity, condensed matter analogs) and gravitational dynamics in AdS bulk If holographic emergence generalizes to cosmological de Sitter spacetime, specific structural imprints should appear in cosmological correlators beyond standard [[inflation]] predictions Quantum error correction codes that reconstruct bulk from boundary make precise claims about which boundary degrees of freedom encode which bulk regions, testable in lattice realizations	2010 framework: Newton's law of gravity recovered as an entropic force on holographic screens; relativistic generalization should match GR at leading order 2016 dark-matter extension: a specific scale-dependent extra gravitational potential producing MOND-like behavior in galaxies, without dark-matter particles Specific baryonic Tully-Fisher-like relations between baryonic mass and apparent dark mass; deviations from the predicted scaling falsify the dark-matter extension
Where it breaks	AdS/CFT is exact only in anti-de Sitter spacetime; our universe is de Sitter, and de Sitter holography is unsolved despite multiple programs (dS/CFT, swampland, FRW holography) The 'holographic emergence' claim is tightly tied to special backgrounds; whether it tells us anything about real cosmology is contested ER=EPR is largely conceptual: it rephrases known relationships between entanglement and geometry rather than producing distinctive empirical predictions Holography provides many dualities but no unique emergent description of our specific universe	Lelli, McGaugh & Schombert (2017) tested the 2016 prediction against the radial acceleration relation across ~150 SPARC-database galaxies and found inconsistencies with the predicted scaling at low accelerations Tamosiunas et al. (2019) tested the prediction at galaxy-cluster scales and found significant tension with observed lensing profiles The original 2010 entropic derivation has been criticized for assuming too much input (Bekenstein-Hawking entropy-area law, Unruh temperature) to legitimately derive Newton's gravity from first principles The microscopic model of underlying degrees of freedom remains vague; critics see the framework as under-specified compared to explicit dark-matter models No fully relativistic, calculable version of the 2016 dark-matter scheme exists; observational analyses use phenomenological approximations
Key unresolved problem	The wrong-universe problem: the entanglement-builds-geometry story works exactly only in anti-de Sitter space, a negatively curved, non-expanding kind of cosmos, and after 25 years no one has shown it carries over to our actually expanding de Sitter universe.	The cluster mismatch: the 2016 version that tries to do away with dark matter predicts how galaxy clusters should bend light, but those predictions miss the real measurements by a wide margin, and no fully worked-out relativistic version exists to fix it.
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Holographic Spacetime

1997 / 2010 · Frontier

Verlinde Entropic Gravity

2011 / 2017 · Frontier

Proposed

1997 / 2010

2011 / 2017

Key figures

Juan Maldacena, Mark Van Raamsdonk, Shinsei Ryu, Tadashi Takayanagi, Leonard Susskind

Erik Verlinde

In one sentence

Spacetime geometry emerges from quantum entanglement in a lower-dimensional theory without gravity, as established by AdS/CFT in anti-de Sitter space. Whether this generalizes to our de Sitter universe is an open question.

Verlinde proposed that gravity is not a fundamental force but an entropic effect arising from changes in information on holographic screens. The 2016 extension to dark matter has been substantially constrained by 2017-2019 weak-lensing and radial-acceleration-relation tests.

Predictions

AdS/CFT predicts precise relationships between strongly coupled QFT correlators (e.g., quark-gluon plasma viscosity, condensed matter analogs) and gravitational dynamics in AdS bulk
If holographic emergence generalizes to cosmological de Sitter spacetime, specific structural imprints should appear in cosmological correlators beyond standard [[inflation]] predictions
Quantum error correction codes that reconstruct bulk from boundary make precise claims about which boundary degrees of freedom encode which bulk regions, testable in lattice realizations

2010 framework: Newton's law of gravity recovered as an entropic force on holographic screens; relativistic generalization should match GR at leading order
2016 dark-matter extension: a specific scale-dependent extra gravitational potential producing MOND-like behavior in galaxies, without dark-matter particles
Specific baryonic Tully-Fisher-like relations between baryonic mass and apparent dark mass; deviations from the predicted scaling falsify the dark-matter extension

Where it breaks

AdS/CFT is exact only in anti-de Sitter spacetime; our universe is de Sitter, and de Sitter holography is unsolved despite multiple programs (dS/CFT, swampland, FRW holography)
The 'holographic emergence' claim is tightly tied to special backgrounds; whether it tells us anything about real cosmology is contested
ER=EPR is largely conceptual: it rephrases known relationships between entanglement and geometry rather than producing distinctive empirical predictions
Holography provides many dualities but no unique emergent description of our specific universe

Lelli, McGaugh & Schombert (2017) tested the 2016 prediction against the radial acceleration relation across ~150 SPARC-database galaxies and found inconsistencies with the predicted scaling at low accelerations
Tamosiunas et al. (2019) tested the prediction at galaxy-cluster scales and found significant tension with observed lensing profiles
The original 2010 entropic derivation has been criticized for assuming too much input (Bekenstein-Hawking entropy-area law, Unruh temperature) to legitimately derive Newton's gravity from first principles
The microscopic model of underlying degrees of freedom remains vague; critics see the framework as under-specified compared to explicit dark-matter models
No fully relativistic, calculable version of the 2016 dark-matter scheme exists; observational analyses use phenomenological approximations

Key unresolved problem

The wrong-universe problem: the entanglement-builds-geometry story works exactly only in anti-de Sitter space, a negatively curved, non-expanding kind of cosmos, and after 25 years no one has shown it carries over to our actually expanding de Sitter universe.

The cluster mismatch: the 2016 version that tries to do away with dark matter predicts how galaxy clusters should bend light, but those predictions miss the real measurements by a wide margin, and no fully worked-out relativistic version exists to fix it.

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