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arXiv · 1807.10028

Non-locality and late-time cosmic acceleration from an ultraviolet complete theory

Gaurav Narain·Tianjun Li
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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.

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Gaurav Narain, Tianjun Li. 2018-07-26. Non-locality and late-time cosmic acceleration from an ultraviolet complete theory. https://doi.org/10.3390/universe4080082

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