Lima, William C. C. orcid.org/0000-0003-4426-4668 (2021) Graviton backreaction on the local cosmological expansion in slow-roll inflation. Classical and Quantum Gravity. 135015. ISSN 1361-6382
Abstract
We compute the graviton one-loop correction to the expectation value of the local expansion rate in slow-roll inflation, with both slow-roll parameters finite. The calculation is based on a recent method to explicitly construct gauge-invariant observables in perturbative quantum gravity at all orders in perturbation theory, and it is particularly suited in cases of highly-symmetrical space-time backgrounds. Our analysis adds to recent calculations of that correction in de Sitter space-time and in single-field inflation with constant deceleration. In the former case a vanishing one-loop correction was found, while in the latter the quantum backreaction produces a secular effect that accelerates the expansion. The quantum correction we describe here produces a finite secular effect that can either accelerated or decelerate the background expansion, depending on the value of the slow-roll parameters.
Metadata
Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2021 The Author(s). |
Keywords: | Perturbative Quantum Gravity, Gauge-invariant Observables, Hubble Rate, Inflation |
Dates: |
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Institution: | The University of York |
Academic Units: | The University of York > Faculty of Sciences (York) > Mathematics (York) |
Depositing User: | Pure (York) |
Date Deposited: | 19 Apr 2021 11:50 |
Last Modified: | 06 Dec 2023 14:12 |
Published Version: | https://doi.org/10.1088/1361-6382/abfaeb |
Status: | Published |
Refereed: | Yes |
Identification Number: | https://doi.org/10.1088/1361-6382/abfaeb |
Related URLs: |
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Filename: Lima_2021_Class._Quantum_Grav._38_135015.pdf
Description: Graviton backreaction on the local cosmological expansion in slow-roll inflation
Licence: CC-BY 2.5