"Detuned" f(R) gravity and dark energy

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dc.creatorDeruelle, Nathalie
dc.creatorSasaki, Misao
dc.creatorSendouda, Yuuiti
dc.date2008-03-19
dc.date2008-04-02
dc.date.accessioned2026-07-07T11:33:16Z
dc.date.available2026-07-07T11:33:16Z
dc.descriptionIn gravity theories derived from a f(R) Lagrangian, matter is usually supposed to be minimally coupled to the metric, which hence defines a ``Jordan frame.'' However, since the field equations are fourth order, gravity possesses an extra degree of freedom on top of the standard graviton, as is manifest from its equivalent description in the conformally related, Einstein, frame. We introduce explicitly this extra scalar degree of freedom in the action and couple it to matter, so that the original metric no longer defines a Jordan frame. This ``detuning'' puts f(R) gravity into a wider class of scalar--tensor theories. We argue that a ``chameleon-like'' detuning tracing the background matter density may provide purely gravitational models which account for the present acceleration of the universe and evade local gravity constraints.
dc.description10 pages, no figure; a clarifying comment added, typos corrected, references added
dc.identifierhttps://arxiv.org/abs/0803.2742
dc.identifierhttp://arxiv.org/abs/0803.2742
dc.identifierPhys.Rev.D77:124024,2008
dc.identifierdoi:10.1103/PhysRevD.77.124024
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/197830
dc.subjectGeneral Relativity and Quantum Cosmology
dc.subjectAstrophysics
dc.subjectHigh Energy Physics - Theory
dc.title"Detuned" f(R) gravity and dark energy
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