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Universe 2015, 1(2), 186-198; doi:10.3390/universe1020186

Generalized ƒ(R,Φ, X) Gravity and the Late-Time Cosmic Acceleration

1
Department of Mathematics and Institute of Origins, University College London, Gower Street, London WC1E 6BT, UK
2
Instituto de Astrofísica e Ciências do Espaço, Faculdade de Ciências, Universidade de Lisboa, Campo Grande, PT1749-016 Lisboa, Portugal
3
Faculdade de Ciências da Universidade de Lisboa, Edifício C8, Campo Grande, P-1749-016Lisboa, Portugal
*
Author to whom correspondence should be addressed.
Academic Editors: Kazuharu Bamba and Sergei D. Odintsov
Received: 25 June 2015 / Revised: 4 August 2015 / Accepted: 7 August 2015 / Published: 18 August 2015
(This article belongs to the Special Issue Modified Gravity Cosmology: From Inflation to Dark Energy)
View Full-Text   |   Download PDF [302 KB, uploaded 18 August 2015]   |  

Abstract

High-precision observational data have confirmed with startling evidence that the Universe is currently undergoing a phase of accelerated expansion. This phase, one of the most important and challenging current problems in cosmology, represents a new imbalance in the governing gravitational equations. Historically, physics has addressed such imbalances by either identifying sources that were previously unaccounted for or by altering the gravitational theory. Several candidates, responsible for this expansion, have been proposed in the literature, in particular dark energy models and modified gravity models, amongst others. Outstanding questions are related to the nature of this so-called “dark energy” that is driving this acceleration, and whether it is due to the vacuum energy or a dynamical field. On the other hand, the late-time cosmic acceleration may be due to modifications of general relativity. In this work, we explore a generalised modified gravity theory, namely ƒ(R,Φ, X) gravity, where R is the Ricci scalar, R is a scalar field and X is a kinetic term. This theory contains a wide range of dark energy and modified gravity models. We considered specific models and applications to the late-time cosmic acceleration. View Full-Text
Keywords: cosmology; modified gravity; dark energy cosmology; modified gravity; dark energy
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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MDPI and ACS Style

Bahamonde, S.; Böhmer, C.G.; Lobo, F.S.; Sáez-Gómez, D. Generalized ƒ(R,Φ, X) Gravity and the Late-Time Cosmic Acceleration. Universe 2015, 1, 186-198.

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