Tsujikawa, Phys. Rev. D 77, 023507 (2008)
Tsujikawa, Phys. Rev. D 77, 023507 (2008)
Tsujikawa, Phys. Rev. D 77, 023507 (2008)
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・・In the future ( ), the crossings ofthe phantom divide are the generic feature for all theexisting viable f(R) models.As z decreases ( ), dark energybecomes much more dominant over non-relativistic matter( ).No. 25< Effective equation of state for the universe >: Total energy density of the universe: Total pressure of the universeP DEP mP r: Pressure of dark energy: Pressure of non-relativistic matter(cold dark matter and baryon): Pressure of radiation