Selected Honorable Mention EssaysNo Access

HYBRID MODIFIED GRAVITY UNIFYING LOCAL TESTS, GALACTIC DYNAMICS AND LATE-TIME COSMIC ACCELERATION

Dipartimento di Fisica, Università di Napoli, Federico II Complesso Universitario di Monte Sant'Angelo, Edificio G, Via Cinthia, I-80126 Napoli, Italy

Instituto Nazionale di Fisica Nucleare Sezlione di Napoli, Complesso Universitario di Monte Sant'Angelo, Edificio G, Via Cinthia, I-80126 Napoli, Italy

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TIBERIU HARKO

Department of Mathematics, University College London, Gower Street, London, WC1E 6BT, UK

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FRANCISCO S. N. LOBO

Centro de Astronomia e Astrofísica da Universidade de Lisboa, Campo Grande, Ed. C8 1749-016 Lisboa, Portugal

Corresponding author.

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and

GONZALO J. OLMO

Departamento de Física Teórica and Instituto de Fisica Corpuscular (IFIC), Centro Mixto Universidad de Valencia – Consejo, Superior de Investigaciones Cientificas (CSIC), Universidad de Valencia, Burjassot-46100, Valencia, Spain

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https://doi.org/10.1142/S0218271813420066Cited by:35

Abstract

The nonequivalence between the metric and Palatini formalisms of f(R) gravity is an intriguing feature of these theories. However, in the recently proposed hybrid metric-Palatini gravity, consisting of the superposition of the metric Einstein–Hilbert Lagrangian with an term constructed à la Palatini, the "true" gravitational field is described by the interpolation of these two nonequivalent approaches. The theory predicts the existence of a light long-range scalar field, which passes the local constraints and affects the galactic and cosmological dynamics. Thus, the theory opens new possibilities for a unified approach, in the same theoretical framework, to the problems of dark energy and dark matter, without distinguishing a priori matter and geometric sources, but taking their dynamics into account under the same standard.

This essay received an honorable mention in the 2013 Essay Competition of the Gravity Research Foundation.

Keywords:

PACS: 04.50.Kd, 04.20.Cv

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Published: 30 August 2013

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History

Received 16 May 2013

Accepted 10 August 2013
Keywords
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HYBRID MODIFIED GRAVITY UNIFYING LOCAL TESTS, GALACTIC DYNAMICS AND LATE-TIME COSMIC ACCELERATION

Abstract

References

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