Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2006-02-16
Phys.Lett.B635:7-10,2006
Physics
High Energy Physics
High Energy Physics - Theory
Latex, 9 pages, to appear in PLB; v2: typos corrected, a reference added
Scientific paper
10.1016/j.physletb.2006.02.035
In the paper, hep-th/0501055 (R.G. Cai and S.P. Kim, JHEP {\bf 0502}, 050 (2005)), it is shown that by applying the first law of thermodynamics to the apparent horizon of an FRW universe and assuming the geometric entropy given by a quarter of the apparent horizon area, one can derive the Friedmann equations describing the dynamics of the universe with any spatial curvature; using the entropy formula for the static spherically symmetric black holes in Gauss-Bonnet gravity and in more general Lovelock gravity, where the entropy is not proportional to the horizon area, one can also obtain the corresponding Friedmann equations in each gravity. In this note we extend the study of hep-th/0501055 to the cases of scalar-tensor gravity and $f(R)$ gravity, and discuss the implication of results.
Akbar M. M.
Cai Rong-Gen
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