Issue |
EPL
Volume 98, Number 3, May 2012
|
|
---|---|---|
Article Number | 30010 | |
Number of page(s) | 5 | |
Section | General | |
DOI | https://doi.org/10.1209/0295-5075/98/30010 | |
Published online | 10 May 2012 |
The generalized second law of gravitational thermodynamics on the apparent horizon in f(R)-gravity
1
Department of Physics, University of Kurdistan - Pasdaran St., Sanandaj, Iran
2
Research Institute for Astronomy & Astrophysics of Maragha (RIAAM) - Maragha, Iran
a
KKarami@uok.ac.ir
b
MS.Khaledian@uok.ac.ir
Received:
3
April
2012
Accepted:
14
April
2012
We investigate the generalized second law (GSL) of thermodynamics in the framework of f(R)-gravity. We consider a FRW universe filled only with ordinary matter enclosed by the dynamical apparent horizon with the Hawking temperature. For a viable modified gravity model as f(R)=R− α/R+βR2, we examine the validity of the GSL during the early-inflation and late-acceleration eras. Our results show that for the selected f(R)-gravity model minimally coupled with matter, the GSL in the early-inflation epoch is satisfied only for the special range of the equation-of-state parameter of matter. But in the late-acceleration regime, the GSL is always respected.
PACS: 04.50.Kd – Modified theories of gravity
© EPLA, 2012
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