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2007

Hidden past of dark energy cosmological models

Fernandez-Jambrina, L.

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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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