Year: 2012
Type: article
Abstract: We investigate the validity of the generalized second law (GSL) of gravitational thermodynamics in the framework of f ( T ) modified teleparallel gravity. We consider a spatially flat FRW universe containing only the pressureless matter. The boundary of the universe is assumed to be enclosed by the Hubble horizon. For two viable f ( T ) models containing f ( T ) = T +μ 1 {(− T )} n and f ( T ) = T −μ 2 T (1− e β T 0 / T ), we first calculate the effective equation of state and deceleration parameters. Then, {we investigate the null and strong energy conditions and conclude that a sudden future singularity appears in both models. Furthermore, using a cosmographic analysis we check the viability of two models. Finally, we examine the validity of the GSL and find that for both models it} is satisfied from the early times to the present epoch. But in the future, the GSL is violated for the special ranges of the torsion scalar T .
Authors: K Karami, A Abdolmaleki
Language: English
Subfield: Astronomy and Astrophysics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W2019289187