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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S ∝ H à2H・ Since , the oscillating behavior of comesfrom that of .Cf.However, it should be emphasized that althoughS decreases in some regions, the second law ofthermodynamics in f(R) gravity can be alwayssatisfied.SThis is because is the cosmological horizonentropy and it is not the total entropy of theuniverse including the entropy of generic matter.It has been shown that the second law ofthermodynamics can be verified in both phantom andnon-phantom phases for the same temperature of theuniverse outside and inside the apparent horizon.S[KB and Geng, JCAP 1006, 014 (2010)]No. 40