Hidden past of dark energy cosmological models

Details Hidden past of dark energy cosmological models Hidden past of dark energy cosmological models

2007-04-30

arxiv.org/abs/0704.3936v3

Phys.Lett.B656:9-14,2007

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

6 pages, 1 figure, RevTeX4, new references and comments added

Scientific paper

10.1016/j.physletb.2007.08.091

In this paper we analyse the possibility of having homogeneous isotropic cosmological models with observers reaching $t=\infty$ in finite proper time. It is shown that just observationally-suggested dark energy models with $w\in(-5/3,-1)$ show this feature and that they are endowed with an exotic curvature singularity. Furthermore, it is shown that non-accelerated observers in these models may experience a duration of the universe as short as desired by increasing their linear momentum. A subdivision of phantom models in two families according to this behavior is suggested.

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