مشخصات پژوهش

عنوان	Cosmological viability conditions for f(T ) dark energy models
نوع پژوهش	مقاله چاپ‌شده در مجلات علمی
کلیدواژه‌ها	modified gravity, dark energy theory
چکیده	Recently f(T) modified teleparallel gravity where T is the torsion scalar 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.
پژوهشگران	ناصر محمدی پور (نفر دوم)، محمد رضا ستاره (نفر اول)