Hidden past of dark energy cosmological models

Abstract

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.

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

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• Initial directional singularity in inflationary models
• Type V singularities in non-standard cosmological backgrounds
• New futures for cosmological models
• Type V singularities with inhomogeneous equations of state
• Instability of scalar perturbation in a phantomic cosmological scenario
• Singularities in inflationary cosmological models
• A Spectrum of Cosmological Rips and Their Observational Signatures