The spectrum of quantum gravity

Calmet, X and Latosh, B (2019) The spectrum of quantum gravity. Particles and Nuclei, Letters, 16 (6). ISSN 1814-5957

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In this paper we consider the degrees of freedom beyond the graviton present in the effective field theory for quantum gravity. We point out that the position of the poles due to R2 and RµνRµν cannot be affected by operators that are higher order in curvature. On the other hand, operators of the type RR will lead to new poles while shifting the positions of the poles found at second order in curvature. New degrees of freedom can be identified either, as just described, by looking at the poles of the graviton propagator corrected by quantum gravity or by mapping the Jordan frame theory to the Einstein frame theory. While this procedure is very well defined for second order curvature terms in the effective action, we point out that higher order terms in curvature lead to a nonlinear and non-local relation between the propagating scalar degree of freedom and the Ricci scalar. We show how to resolve these ambiguities and how to obtain the correct action in the Einstein frame. We illustrate our results by looking at f(R) gravity

Item Type: Article
Schools and Departments: School of Mathematical and Physical Sciences > Physics and Astronomy
Subjects: Q Science > QC Physics
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Depositing User: Xavier Calmet
Date Deposited: 07 Aug 2019 10:50
Last Modified: 02 Jan 2020 14:16

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