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Snowmass 2021 White Paper: Observational Signatures of Quantum Gravity

Zurek, Kathryn M. (2022) Snowmass 2021 White Paper: Observational Signatures of Quantum Gravity. . (Unpublished)

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This short review is intended as a colloquium-level summary, for the Snowmass 2021 process, on recent theoretical results on infrared observables in quantum gravity. We rely on simple physical arguments, most notably a random walk intuition, to show how effects of quantum gravity in the ultraviolet (at the Planck length ℓₚ ≈ 10⁻³⁵ m) may integrate into the infrared when the large measurement length scale L enters into the observable. A quantum uncertainty at lightsheet horizons would give rise to an accumulated effect of size δL² ≃ ℓₚL/4π. We discuss how the random walk intuition falls out from more formal calculations, such as from AdS/CFT, from the dimensional reduction of the Einstein-Hilbert action to dilaton gravity, from multiple gravitational shockwaves generated by vacuum energy fluctuations, as well as from an effective description of gravity as a fluid. We overview experimental prospects for measuring this effect with a simple Michelson interferometer utilizing many of the tools developed for gravitational wave observatories.

Item Type:Report or Paper (White Paper)
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URLURL TypeDescription Paper
Zurek, Kathryn M.0000-0002-2629-337X
Additional Information:Attribution 4.0 International (CC BY 4.0). I thank my collaborators Erik Verlinde, Tom Banks, Yanbei Chen, Dongjun Li, Vincent Lee, Sergei Gukov, Lee McCuller, Rana Adhikari, Cynthia Keeler, Temple He and Allic Sivaramakrishnan for ongoing discussion and work on these directions. This is supported by the Heising-Simons Foundation “Observational Signatures of Quantum Gravity” collaboration grant 2021-2817, by the DoE under contract DE-SC0011632, and by a Simons Investigator award.
Group:Walter Burke Institute for Theoretical Physics
Funding AgencyGrant Number
Heising-Simons Foundation2021-2817
Department of Energy (DOE)DE-SC0011632
Simons FoundationUNSPECIFIED
Record Number:CaltechAUTHORS:20220816-192441646
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:116320
Deposited By: George Porter
Deposited On:16 Aug 2022 22:40
Last Modified:02 Jun 2023 01:25

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