Volume 98, Number 3, May 2012
|Number of page(s)||5|
|Published online||10 May 2012|
The generalized second law of gravitational thermodynamics on the apparent horizon in f(R)-gravity
Department of Physics, University of Kurdistan - Pasdaran St., Sanandaj, Iran
2 Research Institute for Astronomy & Astrophysics of Maragha (RIAAM) - Maragha, Iran
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
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.