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Universe 2018, 4(8), 88;

The Case for Nonlocal Modifications of Gravity

Department of Physics, University of Florida, Gainesville, FL 32611, USA
Received: 5 July 2018 / Revised: 3 August 2018 / Accepted: 6 August 2018 / Published: 10 August 2018
(This article belongs to the Special Issue Gravity, Black Holes and Cosmology XXI)
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The huge amounts of undetected and exotic dark matter and dark energy needed to make general relativity work on large scales argue that we should investigate modifications of gravity. The only stable, metric-based and invariant alternative to general relativity is f(R) models. These models can explain primordial inflation, but they cannot dispense with either dark matter or dark energy. I advocate nonlocal modifications of gravity, not as new fundamental theories but rather as the gravitational vacuum polarization engendered by infrared quanta produced during primordial inflation. I also discuss some of the many objections which have been raised to this idea. View Full-Text
Keywords: Nonlocal gravity; dark energy; dark matter; primordial inflation. Nonlocal gravity; dark energy; dark matter; primordial inflation.
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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Woodard, R.P. The Case for Nonlocal Modifications of Gravity. Universe 2018, 4, 88.

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