One-loop quantum gravitational backreaction on the local Hubble rate
General Relativity and Quantum Cosmology
2019-04-15 v2 High Energy Physics - Theory
Abstract
We determine corrections to the Hubble rate due to graviton loops in a cosmological background spacetime of constant deceleration parameter. The corrections are gauge-invariant, based on a recent proposal for all-order gauge-invariant observables in perturbative quantum gravity. We find explicit expressions for the cases of matter- and radiation-dominated eras and slow-roll inflation with vanishing second slow-roll parameter. Interestingly, in the latter case the corrections can be described by a quantum-corrected first slow-roll parameter, which brings the spacetime closer to de Sitter space.
Cite
@article{arxiv.1806.11124,
title = {One-loop quantum gravitational backreaction on the local Hubble rate},
author = {Markus B. Fröb},
journal= {arXiv preprint arXiv:1806.11124},
year = {2019}
}
Comments
35 pages, includes comparison with other approaches, matches published version