Phenomenology of Holography via Quantum Coherence on Causal Horizons
Abstract
There is much recent development towards interferometric measurements of holographic quantum uncertainties in an emergent background spacetime. Despite increasing promise for the target detection regime of Planckian strain power spectral density, the foundational insights of the motivating theories have not been connected to a phenomenological model of observables measured in a realistic experiment. This work proposes a candidate model, based on the central hypothesis that all horizons are universal boundaries of coherent quantum information  where the decoherence of spacetime happens for the observer. The prediction is inspired by 't Hooft's algebra for black hole information that gives coherent states on horizons, whose spatial correlations were shown by Verlinde and Zurek to also appear on holographic fluctuations of causal boundaries in flat spacetime (conformal Killing horizons). Timedomain correlations are projected from Planckian jitters whose coherence scales match causal diamonds, motivated by Banks' framework for the emergence of spacetime and locality. The universality of this coherence on causal horizons compels a multimodal research program probing concordant signatures: An analysis of cosmological data to probe primordial correlations, motivated by Hogan's interpretation of wellknown CMB anomalies as coherent fluctuations on the inflationary horizon, and upcoming 3D interferometers to probe causal diamonds in flat spacetime. Candidate interferometer geometries are presented, with a modeled frequency spectrum for each design.
 Publication:

arXiv eprints
 Pub Date:
 April 2022
 DOI:
 10.48550/arXiv.2204.12080
 arXiv:
 arXiv:2204.12080
 Bibcode:
 2022arXiv220412080K
 Keywords:

 General Relativity and Quantum Cosmology;
 Quantum Physics
 EPrint:
 22 pages, 14 figures