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We propose a new exponential f(R)gravity model with f(R)=(Rλc)eλ(c/R)n and n>3,λ≥1,c>0to explain late-time acceleration of the universe.At the high curvature region,the model behaves like theΛCDM model.In the asymptotic future,it reaches a stable de-Sitter spacetime.It is a cosmologically viable model and can evade the local gravity constraints easily.This model shares many features with other f(R)dark energy models like Hu–Sawicki model and Exponential gravity model.In it the dark energy equation of state is of an oscillating form and can cross phantom divide lineωde=1.In particular,in the parameter range 33 andλ>1.
We propose a new exponential f (R) gravity model with f (R) = (Rλc) eλ (c / R) n and n> 3, λ≥1, c> 0to explain late-time acceleration of the universe. At the high curvature region, the model behaves like theCDM model.In the asymptotic future, it reaches a stable de-Sitter spacetime. It is a cosmologically viable model and can evade the local gravity constraints easily. This model shares many features with other f (R ) dark energy models like Hu-Sawicki model and Exponential gravity model. In the dark energy equation of state is an oscillating form and can cross phantom divide line ωde = 1. In particular, in the parameter range 3 3 and λ> 1.