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  Quantum phenomenological gravitational dynamics: A general view from thermodynamics of spacetime

Alonso-Serrano, A., & Liška, M. (2020). Quantum phenomenological gravitational dynamics: A general view from thermodynamics of spacetime. Journal of High Energy Physics, 2020(12): 196. doi:10.1007/JHEP12(2020)196.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0007-0FB4-E Version Permalink: http://hdl.handle.net/21.11116/0000-0007-A51D-F
Genre: Journal Article

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 Creators:
Alonso-Serrano, Ana1, Author              
Liška, Marek, Author
Affiliations:
1Quantum Gravity & Unified Theories, AEI-Golm, MPI for Gravitational Physics, Max Planck Society, ou_24014              

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Free keywords: General Relativity and Quantum Cosmology, gr-qc,High Energy Physics - Theory, hep-th
 Abstract: In this work we derive general quantum phenomenological equations of gravitational dynamics and analyse its features. The derivation uses the formalism developed in thermodynamics of spacetime and introduces low energy quantum gravity modifications to it. Quantum gravity effects are considered via modification of Bekenstein entropy by an extra logarithmic term in the area. This modification is predicted by several approaches to quantum gravity, including loop quantum gravity, string theory, AdS/CFT correspondence and generalised uncertainty principle phenomenology, giving our result a general character. The derived equations generalise classical equations of motion of unimodular gravity, instead of the ones of general relativity, and they contain at most second derivatives of the metric. We provide two independent derivations of the equations based on thermodynamics of local causal diamonds. First one uses Jacobson's maximal vacuum entanglement hypothesis, the second one Clausius entropy flux. Furthermore, we consider questions of diffeomorphism and local Lorentz invariance of the resulting dynamics and discuss its application to a simple cosmological model, finding a resolution of the classical singularity.

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 Dates: 2020-09-082020-12-30
 Publication Status: Published in print
 Pages: 29 pages, 1 figure
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 Table of Contents: -
 Rev. Type: -
 Identifiers: arXiv: 2009.03826
DOI: 10.1007/JHEP12(2020)196
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Title: Journal of High Energy Physics
Source Genre: Journal
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Pages: - Volume / Issue: 2020 (12) Sequence Number: 196 Start / End Page: - Identifier: -