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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Future crossing of the phantom divide(i) Hu-Sawicki model(ii) Starobinsky’s model[Hu and Sawicki, <strong>Phys</strong>. <strong>Rev</strong>. D 76, 064004 (2007)]p =1c 1 =1 c 2 =1 ,[Starobinsky, JETP Lett. 86, 157 (2007)]n =2õ =1.5No. 30(iii) <strong>Tsujikawa</strong>’s model[<strong>Tsujikawa</strong>, <strong>Phys</strong>. <strong>Rev</strong>. D <strong>77</strong>, <strong>023507</strong> (<strong>2008</strong>)]ö =1(iv) Exponential gravity model[Cognola, Elizalde, Nojiri, Odintsov,Sebastiani and Zerbini, <strong>Phys</strong>. <strong>Rev</strong>. D <strong>77</strong>,046009 (<strong>2008</strong>)][Linder, <strong>Phys</strong>. <strong>Rev</strong>. D 80, 123528 (2009)]ì =1.8