UV completion of the Starobinsky model, tensor-to-scalar ratio, and constraints on nonlocality

Edholm, James (2017) UV completion of the Starobinsky model, tensor-to-scalar ratio, and constraints on nonlocality. Physical Review D, 95 (4). ISSN 1550-7998

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Abstract

In this paper, we build upon the successes of the ultraviolet (UV) completion of the Starobinsky model of inflation. This involves an extension of the Einstein-Hilbert term by an infinite covariant derivative theory of gravity which is quadratic in curvature. It has been shown that such a theory can potentially resolve the cosmological singularity for a flat, homogeneous and isotropic geometry, and now it can also provide a successful cosmological inflation model, which in the infrared regime matches all the predictions of the Starobinsky model of inflation. The aim of this paper is to show that the tensor-to-scalar ratio is modified by the scale of nonlocality, and in general a wider range of tensor-to-scalar ratios can be obtained in this class of model, which can put a lower bound on the scale of nonlocality for the first time as large as the O(10^14) GeV.

Item Type: Journal Article
Journal or Publication Title: Physical Review D
Additional Information: © 2017 American Physical Society
Departments: Faculty of Science and Technology > Physics
ID Code: 84590
Deposited By: ep_importer_pure
Deposited On: 15 Feb 2017 13:26
Refereed?: Yes
Published?: Published
Last Modified: 20 Feb 2020 03:09
URI: https://eprints.lancs.ac.uk/id/eprint/84590

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