2007

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

Cognola, G., Elizalde, E., Nojiri, S. et al.

Understand

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-steps models are explicitly considered, but the analysis is extensible to $N$-step models.

S. Nojiri and S. D. Odintsov, arXiv:0706.1378[hep-th]; arXiv:0707.1941[hep-th]
Original
1941
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S. Nojiri and S. D. Odintsov, Phys. Rev. D 68
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S. Capozziello, S. Carloni and A. Troisi, arXiv:astro-ph/0303041; S. M. Carroll, V. Duvvuri, M. Trodden and M. Turner, Phys. Rev. D 70
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S. Nojiri and S. Odintsov, Gen. Rel. Grav. 36
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A. D. Dolgov, M. Kawasaki, Phys. Lett. B 573
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