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

By G. Cognola, E. Elizalde, Shin'ichi Nojiri, Sergei D. Odintsov, Lorenzo Sebastiani, Sergio Zerbini. 2007

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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.

Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/b107841dd64d1eed4d95ea763f0fc147510cd969

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

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