Class of viable modified $f(R)$ gravities describing inflation and the onset of accelerated expansion

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dc.creatorCognola, G.
dc.creatorElizalde, E.
dc.creatorNojiri, S.
dc.creatorOdintsov, S. D.
dc.creatorSebastiani, L.
dc.creatorZerbini, S.
dc.date2007-12-24
dc.date2008-01-30
dc.date.accessioned2026-07-07T11:13:55Z
dc.date.available2026-07-07T11:13:55Z
dc.descriptionA general approach to viable modified $f(R)$ gravity is developed in both the Jordan and the Einstein frames. A class of exponential, realistic modified gravities is introduced and investigated with care. Special focus is made on step-class models, most promising from the phenomenological viewpoint and which provide a natural way to classify all viable modified gravities. One- and two-steps models are explicitly considered, but the analysis is extensible to $N$-step models. Both inflation in the early universe and the onset of recent accelerated expansion arise in these models in a natural, unified way. Moreover, it is demonstrated that models in this category easily pass all local tests, including stability of spherical body solution, non-violation of Newton's law, and generation of a very heavy positive mass for the additional scalar degree of freedom.
dc.description15 pages, 2 figures, version to appear in Physical Review D
dc.identifierhttps://arxiv.org/abs/0712.4017
dc.identifierhttp://arxiv.org/abs/0712.4017
dc.identifierPhys.Rev.D77:046009,2008
dc.identifierdoi:10.1103/PhysRevD.77.046009
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/191889
dc.subjectHigh Energy Physics - Theory
dc.subjectAstrophysics
dc.subjectGeneral Relativity and Quantum Cosmology
dc.titleClass of viable modified $f(R)$ gravities describing inflation and the onset of accelerated expansion
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