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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Flat Friedmann-Lema tre-Robertson-Walker (FLRW)space-time >a(t): Scale factorNo. 20Gravitational field equations in the FLRW background:: Hubble parameterú M and P M : Energy density and pressure of all perfectfluids of matter, respectively.< Analysis method > [Hu and Sawicki, <strong>Phys</strong>. <strong>Rev</strong>. D 76, 064004 (2007)](1)・ Ricci scalar:(2)0(prime): Derivative withrespect toR