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

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

Bahamonde, S; Boehmer, CG; Lobo, FSN; Saez-Gomez, D; (2015) Generalized ƒ(R,Φ, X) Gravity and the Late-Time Cosmic Acceleration. Universe , 1 (2) pp. 186-198. 10.3390/universe1020186. Green open access

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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.

Type:	Article
Title:	Generalized ƒ(R,Φ, X) Gravity and the Late-Time Cosmic Acceleration
Open access status:	An open access version is available from UCL Discovery
DOI:	10.3390/universe1020186
Publisher version:	http://dx.doi.org/10.3390/universe1020186
Language:	English
Additional information:	© 2015 by the authors; licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution license (http://creativecommons.org/licenses/by/4.0/).
Keywords:	Cosmology; modified gravity; dark energy
UCL classification:	UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Mathematics
URI:	https://discovery.ucl.ac.uk/id/eprint/1471581