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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No. 24*・: Gravitational field equation [Bengochea and Ferraro, <strong>Phys</strong>.A prime denotes a derivative with respect to .We assume the flat FLRW space-timewith the metric.<strong>Rev</strong>. D 79, 124019 (2009)]Modified Friedmann equations in the flat FLRW background:T,*A prime denotes a derivative with respect to .・ We consider only non-relativistic matter (cold dark matter and baryon).