Review
Version 2
This version is not peer-reviewed
Quantum Gravity: Parameters for Detection via Spin Entanglement and Theoretical Models
Version 1
: Received: 19 November 2023 / Approved: 22 November 2023 / Online: 22 November 2023 (05:46:21 CET)
Version 2 : Received: 25 August 2024 / Approved: 27 August 2024 / Online: 27 August 2024 (10:49:14 CEST)
Version 2 : Received: 25 August 2024 / Approved: 27 August 2024 / Online: 27 August 2024 (10:49:14 CEST)
How to cite: Kohli, A. Quantum Gravity: Parameters for Detection via Spin Entanglement and Theoretical Models. Preprints 2023, 2023111386. https://doi.org/10.20944/preprints202311.1386.v2 Kohli, A. Quantum Gravity: Parameters for Detection via Spin Entanglement and Theoretical Models. Preprints 2023, 2023111386. https://doi.org/10.20944/preprints202311.1386.v2
Abstract
Quantum gravity is crucial for unifying general relativity and quantum mechanics, which are two of the fundamental pillars of physics. Despite the significant advances in theoretical models of quantum gravity, experimental validation of these theories remains sparse. This review paper aims to address this gap by examining the experimental proposal by Bose et al., that aims to show the non classicality of gravity, alongside a discussion of semiclassical and quantum models and their shortcomings. We explore the Double Stern-Gerlach experiment to observe gravitational entanglement, detailing the procedure and the quantum states involved. The minimization of Casimir-Polder forces, which could interfere with the experiment, is highlighted as essential for optimizing conditions for maximal entanglement, calculated using von Neumann entropy, and measured using an Entanglement Witness. We discuss the inferences drawn from this experiment and introduce semiclassical gravitational models, outlining the assumptions made by Bose et al. Furthermore, we delve into perturbative Quantum Gravity (pQG) using the path integral approach, explaining its non renormalizability and the extent of its applicability. The conclusions indicate that observing entanglement would demonstrate the non-classicality of gravity. While semiclassical models are experimentally inaccurate, they serve as useful calculational tools for black hole physics. Although pQG has proved to be non-renormalizable so far, it functions as an effective field theory (EFT) at energies below 1019 GeV.
Keywords
quantum gravity; gravitational entanglement; semiclassical gravity; perturbative quantum gravity
Subject
Physical Sciences, Particle and Field Physics
Copyright: This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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