Observational Probes of Holography with Quantum Coherence on Causal Horizons

Kwon, Oh-Kyung

doi:10.48550/arxiv.2204.12080

Cited by 5 publications

(12 citation statements)

References 44 publications

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“…Our work complements prior ones [11,16,23] by taking a phenomenological approach to relate spacetime fluctuations to their electromagnetic signatures. Our model is not derived from a fundamental quantum theory of gravity and is agnostic of the underlying mechanism of spacetime fluctuations.…”

Section: Introductionmentioning

confidence: 83%

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Extracting electromagnetic signatures of spacetime fluctuations

Sharmila,

Vermeulen,

Datta

2024

Class. Quantum Grav.

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We present a formalism to discern the effects of fluctuations of the spacetime metric on electromagnetic radiation. The formalism works via the measurement of electromagnetic field correlations, while allowing a clear assessment of the assumptions involved. As an application of the formalism, we present a model of spacetime fluctuations that appear as random fluctuations of the refractive index of the vacuum in single, and two co-located Michelson interferometers. We compare an interferometric signal predicted using this model to experimental data from the Holometer and aLIGO. We show that if the signal manifests at a frequency at which the interferometers are sensitive, the strength and scale of possible spacetime fluctuations can be constrained. The bounds, thus obtained, on the strength and scale of the spacetime fluctuations, are also shown to be more stringent than the bounds obtained previously using astronomical observation at optical frequencies. The formalism enables us to evaluate proposed experiments such as QUEST for constraining quantum spacetime fluctuations and to design new ones.

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Section: Introductionmentioning

confidence: 83%

“…out (R; R), (23) and the covariance Cov i,j (P out ) = P i out (τ ) P j out (τ + δ τ ) − P i out (τ ) P j out (τ + δ τ ).…”

Section: Interferometric Signaturesmentioning

confidence: 99%

Extracting electromagnetic signatures of spacetime fluctuations

Sharmila,

Vermeulen,

Datta

2024

Class. Quantum Grav.

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“…An important theoretical property of both our phenomenological cosmological holographic model and the EPR system is that coherent displacements are not scalars, but are directional and relational, in the sense that they refer to displacements on the boundaries of causal diamonds relative to their centers. Directional coherence affects how temporal statistics of holographic noise in an interferometer depend on the spatial arrangement of its arms [50].…”

Section: Discussionmentioning

confidence: 99%

“…In principle, such large coherent distortions of causal diamonds in flat space-time could be detected in interferometer experiments [36,37,[49][50][51][52].…”

Section: Magnitude Of Coherent Perturbations On Horizonsmentioning

confidence: 99%

Angular correlations on causally-coherent inflationary horizons

Hogan¹,

Meyer²,

Nathaniel³

et al. 2023

Preprint

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We develop a model for correlations of cosmic microwave background (CMB) anisotropy on the largest angular scales, based on standard causal geometrical relationships in slow-roll inflation. Unlike standard models based on quantized field modes, it describes perturbations with nonlocal directional coherence on spherical boundaries of causal diamonds. Causal constraints reduce the number of independent degrees of freedom, impose new angular symmetries, and eliminate cosmic variance for purely angular 2-point correlations. Distortions of causal structure from vacuum fluctuations are modeled as gravitational memory from randomly oriented outgoing and incoming gravitational null shocks, with nonlocally coherent directional displacements on curved surfaces of causal diamonds formed by standard inflationary horizons. The angular distribution is determined by axially symmetric shock displacements on circular intersections of the comoving sphere that represents the CMB photosphere with other inflationary horizons-those centered on it, and those that pass through an observer's world line. Displacements on thin spheres at the end of inflation have a unique angular power spectrum C that approximates the standard expectation on small angular scales, but differs substantially at large angular scales due to horizon curvature. For a thin sphere, the model predicts a universal angular correlation function C(Θ) with an exact "causal shadow" symmetry, C(π/4 < Θ < 3π/4) = 0, and significant large-angle parity violation. We apply a rank statistic to compare models with WMAP and Planck satellite data, and find that a causally-coherent model with no shape parameters or cosmic variance agrees with the measured C(Θ) better than a large fraction (> 0.9999) of standard model realizations. Model-independent tests of holographic causal symmetries are proposed.

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“…A proposal to resolve the firewall problem that preserves unitarity time evolution has been put forward by 't Hooft [7][8][9][10][11][12], and has continued to be developed in recent years with some engagement from the community in the context of searching for the quantum microstates of black holes (e.g. [13][14][15][16][17]). 't Hooft's proposal is intended to resolve the firewall problem and information problem by including, into the quantum theory, the gravitational interaction of particles entering and leaving the black hole.…”

Section: Introductionmentioning

confidence: 99%

A classical firewall transformation as a canonical transformation

Strauss,

Whiting

2024

Class. Quantum Grav.

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The firewall transformation put forward by 't Hooft in recent years has made ambitious claims of solving the firewall problem and the black hole information paradox while maintaining unitary evolution. However, the theory has received limited attention from the community, especially in regards to its foundations in purely classical gravitational physics. This paper investigates the underlying assumptions of 't Hooft's firewall transformation before quantization. We find that the limiting procedure used by 't Hooft in order to obtain an identification of the quantum operators for ingoing and outgoing particles near a black hole is not consistent. We propose a correction, which involves a more relaxed approximation regime. In the new approximation regime, we find a new classical analog for the firewall transformation for spherical shells, which allows evolving the spherical shells' dynamics past their point of collision. In the classical theory, no firewall is removed, as both ingoing and outgoing matter is present on every spacelike hypersurface, and it does not appear that any firewalls will be removed after a canonical quantization.

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Observational Probes of Holography with Quantum Coherence on Causal Horizons

Cited by 5 publications

References 44 publications

Extracting electromagnetic signatures of spacetime fluctuations

Extracting electromagnetic signatures of spacetime fluctuations

Angular correlations on causally-coherent inflationary horizons

A classical firewall transformation as a canonical transformation

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