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Universe 2015, 1(2), 199-238; doi:10.3390/universe1020199

Hybrid Metric-Palatini Gravity

1
Dipartimento di Fisica, Università di Napoli “Federico I”, Napoli I-80126, Italy
2
INFN Sez. di Napoli, Compl. Univ. di Monte S. Angelo, Edificio G, Via Cinthia, Napoli I-80126, Italy
3
Gran Sasso Science Institute (INFN), Viale F. Crispi 7, I-67100 L’Aquila, Italy
4
Department of Mathematics, University College London, Gower Street, London WC1E-6BT, UK
5
Nordita, KTH Royal Institute of Technology and Stockholm University, Roslagstullsbacken 23, SE-10691 Stockholm, Sweden
6
Instituto de Astrofísica e Ciências do Espaço, Universidade de Lisboa, Edifício C8, Campo Grande, PT1749-016 Lisbon, Portugal
7
Departamento de Física Teórica and IFIC, Centro Mixto Universidad de Valencia - CSIC. Universidad de Valencia, Burjassot-46100, Valencia, Spain
*
Author to whom correspondence should be addressed.
Academic Editors: Kazuharu Bamba and Sergei D. Odintsov
Received: 30 July 2015 / Revised: 19 August 2015 / Accepted: 19 August 2015 / Published: 27 August 2015
(This article belongs to the Special Issue Modified Gravity Cosmology: From Inflation to Dark Energy)
View Full-Text   |   Download PDF [518 KB, uploaded 27 August 2015]

Abstract

Recently, the phenomenology of f(R) gravity has been scrutinized. This scrutiny has been motivated by the possibility to account for the self-accelerated cosmic expansion without invoking dark energy sources. Besides, this kind of modified gravity is capable of addressing the dynamics of several self-gravitating systems alternatively to the presence of dark matter. It has been established that both metric and Palatini versions of these theories have interesting features but also manifest severe and different downsides. A hybrid combination of theories, containing elements from both these two formalisms, turns out to be also very successful accounting for the observed phenomenology and is able to avoid some drawbacks of the original approaches. This article reviews the formulation of this hybrid metric-Palatini approach and its main achievements in passing the local tests and in applications to astrophysical and cosmological scenarios, where it provides a unified approach to the problems of dark energy and dark matter. View Full-Text
Keywords: modified gravity; late-time cosmic acceleration; dark matter; Solar System tests modified gravity; late-time cosmic acceleration; dark matter; Solar System tests
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

Capozziello, S.; Harko, T.; Koivisto, T.S.; Lobo, F.S.N.; Olmo, G.J. Hybrid Metric-Palatini Gravity. Universe 2015, 1, 199-238.

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