Astronomy and Astrophysics – Astrophysics – General Relativity and Quantum Cosmology
Scientific paper
2010-09-15
Europhys.Lett.92:50014,2010
Astronomy and Astrophysics
Astrophysics
General Relativity and Quantum Cosmology
10 pages, minor changes, typos corrected, accepted for publication in Europhysics Letters
Scientific paper
10.1209/0295-5075/92/50014
We consider a spatially flat Friedmann-Lemaitre-Robertson-Walker space time and investigate the second law and the generalized second law of thermodynamics for apparent horizon in generalized modified Gauss Bonnet theory of gravity (whose action contains a general function of Gauss Bonnet invariant and the Ricci scalar: $F(R,G)$). By assuming that the apparent horizon is in thermal equilibrium with the matter inside it, conditions which must be satisfied by $F(R,G)$ are derived and elucidated through two examples: a quasi-de Sitter space-time and a universe with power law expansion.
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