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

G. Cognola, E. Elizalde, S. Nojiri, S. D. Odintsov, L. Sebastiani, S. Zerbini

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    513 Citations (Scopus)

    Abstract

    A 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-step 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, nonviolation of Newton's law, and generation of a very heavy positive mass for the additional scalar degree of freedom. © 2008 The American Physical Society.
    Original languageEnglish
    Article number046009
    JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
    Volume77
    Issue number4
    DOIs
    Publication statusPublished - 27 Feb 2008

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