Scale Factor Dependent Equations of State for Curvature Inspired Dark Energy, Phantom Barrier and Late Cosmic Acceleration

S. K. Srivastava

doi:10.1016/j.physletb.2006.10.035

paper

Scale Factor Dependent Equations of State for Curvature Inspired Dark Energy, Phantom Barrier and Late Cosmic Acceleration

arXiv:astro-ph/0608241 · doi:10.1016/j.physletb.2006.10.035

Abstract

Here, it is found that dark energy and dark matter emerge from the gravitational sector, if non-linear term of scalar curvature is added to Einstein-Hilbert lagrangian. An equation of state for dark energy, having the form $p_{de} = - ρ_{de} + f (a) (w i t h$ p_{\rm de}(ρ_{\rm de}) $b e in g t h e p r ess u r e (d e n s i t y) f or d a r k e n er g y,$ f(a) $b e in g a f u n c t i o n o f sc a l e f e a c t or$ a(t) $an d$ t $b e in g t h ecos mi c t im e) i se x pl or e d . I n t er es t in g l y, t hi se q u a t i o n o f s t a t e l e a d s t o a p han t o mba r r i er$ {\rm w}_{\rm de} = p_{\rm de}/ρ_{\rm de} = - 1 $a t$ a = a_{\rm w} $. I t i s f o u n d t ha tw h e n$ a < a_{\rm w}, {\rm w}_{\rm de} > - 1 $an d$ {\rm w}_{\rm de} < - 1 $f or$ a > a_{\rm w}, $s h o w in g a t r an s i t i o n f r o mn o n - p han t o m t o p han t o m p ha se a t$ a = a_{\rm w} < a_0 (a_0$ being current scale factor of the universe). PACS no.: 98.80 Cq.

10 PAGES. To appear in Phys. Lett. B

Scale Factor Dependent Equations of State for Curvature Inspired Dark Energy, Phantom Barrier and Late Cosmic Acceleration

Abstract

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