DSpace Arşivi :: by Yazar "Abedi, Habib" değerine göre listeleniyor

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Ghost quintessence in fractal gravity
(Indian Acad Sciences, 2015) Abedi, Habib; Salti, Mustafa
In this study, using the time-like fractal theory of gravity, we mainly focus on the ghost dark energy model which was recently suggested to explain the present acceleration of the cosmic expansion. Next, we establish a connection between the quintessence scalar field and fractal ghost dark energy density. This correspondence allows us to reconstruct the potential and the dynamics of a fractal canonical scalar field (the fractal quintessence) according to the evolution of ghost dark energy density.
THERMODYNAMICS IN f (T, ?) GRAVITY
(Editura Acad Romane, 2015) Askin, Muzaffer; Abedi, Habib; Salti, Mustafa
In the present study, we discuss a non-equilibrium picture of thermodynamics at the apparent horizon of flat Friedmann-Roberton-Walker universe in f(T,theta) theory of gravity, where T is the torsion scalar and theta is the trace of the energy-momentum tensor. Mainly, we investigate the validity of the first and second laws of thermodynamics in this scenario. We consider two descriptions of the energy-momentum tensor of dark energy density and pressure and discuss that an equilibrium picture of gravitational thermodynamics can not be given in both cases. Furthermore, we also conclude that the second law of gravitational thermodynamics can be achieved both in phantom and quintessence phases of the universe.