2008

Can F(R)-gravity be a viable model: the universal unification scenario for inflation, dark energy and dark matter

Nojiri, Shin'ichi, Odintsov, Sergei D.

Understand

We review on the viability of $F(R)$-gravity.

We show that recent cosmic acceleration, radiation/matter-dominated epoch and inflation could be realized in the framework of $F(R)$-gravity in the unified way.
For some classes of $F(R)$-gravity, the correction to the Newton law is extremely small and there is no so-called matter instability (the very heavy positive mass for additional scalar degree of freedom is generated).
The reconstruction program in modified gravity is also reviewed and it is demonstrated that {\it any} time-evolution of the universe expansion could be realized in $F(R)$-gravity.

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