Phantom crossing in viable $f(R)$ theories

preprint2011arXivOpen access

We review the equation of state for dark energy in modified gravity theories. In particular, we summarize the generic feature of the phantom divide crossing in the past and future in viable $f(R)$ gravity models.

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Phantom crossing in viable $f(R)$ theories

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Phantom crossing in viable f(R)f(R)f(R) theories

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Phantom crossing in viable $f(R)$ theories