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Universe 2018, 4(8), 82; https://doi.org/10.3390/universe4080082

Non-Locality and Late-Time Cosmic Acceleration from an Ultraviolet Complete Theory

1
Department of Space Science, Beihang University, Beijing 100191, China
2
CAS Key Laboratory of Theoretical Physics, Institute of Theoretical Physics, Chinese Academy of Sciences, Beijing 100190, China
3
School of Physical Sciences, University of Chinese Academy of Sciences, No. 19A Yuquan Road, Beijing 100049, China
*
Author to whom correspondence should be addressed.
Received: 26 June 2018 / Revised: 24 July 2018 / Accepted: 24 July 2018 / Published: 26 July 2018
(This article belongs to the Special Issue Gravity, Black Holes and Cosmology XXI)
Full-Text   |   PDF [232 KB, uploaded 26 July 2018]

Abstract

A local phenomenological model that reduces to a non-local gravitational theory giving dark energy is proposed. The non-local gravity action is known to fit the data as well as Λ-CDM thereby demanding a more fundamental local treatment. It is seen that the scale-invariant higher-derivative scalar-tensor theory of gravity, which is known to be ultraviolet perturbative renormalizable to all loops and where ghosts become innocuous, generates non-locality at low energies. The local action comprises of two real scalar fields coupled non-minimally with the higher-derivative gravity action. When one of the scalar acquiring the Vacuum Expectation Value (VEV) induces Einstein–Hilbert gravity, generates mass for fields, and gets decoupled from system, it leaves behind a residual theory which in turn leads to a non-local gravity generating dark energy effects. View Full-Text
Keywords: perturbative quantum field theory; cosmology; cosmological constant and dark energy; non-locality perturbative quantum field theory; cosmology; cosmological constant and dark energy; non-locality
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Narain, G.; Li, T. Non-Locality and Late-Time Cosmic Acceleration from an Ultraviolet Complete Theory . Universe 2018, 4, 82.

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