Dynamical behaviors and cosmological viability conditions for f(T)dark energy models

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Mohammadi Pour Naser

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Journal Paper

Paper Information

Journal: JOURNAL OF EDUCATION IN BASIC SCIENCES Year:2017 | Volume:3 | Issue:6 Page(s): 56-63

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Title

Dynamical behaviors and cosmological viability conditions for f(T)dark energy models

Author(s)

Mohammadi Pour Naser | Issue Writer Certificate

Keywords

cosmological viability conditions

dark energy

modified gravity

f(T) gravity

Abstract

In this work we consider f(T) modified teleparallel gravity where T is the torsion scalar. This has been proposed as the natural gravitational alternative for dark energy. We perform a detailed dynamical analysis of these models and find conditions for the cosmological viability of f(T) dark energy models as geometrical constraints on the derivatives of these models. We show that in the phase space exists two cosmologically viable trajectory which (i) The universe would start from an unstable radiation point, then pass a saddle standard matter point which is followed by accelerated expansion de sitter point. (ii) The universe starts from a saddle radiation epoch, then falls onto the stable matter era and the system can not evolve to the dark energy dominated epoch. Finally, for a number of f(T) dark energy models were proposed in the more literature, the viability conditions are investigated. So, this gravity is the good candidate for dark energy.

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