Properties of singularities in the (phantom) dark energy universe

By Shin'ichi Nojiri, Sergei D. Odintsov, S. Tsujikawa. 2005

1,037 citations recorded by the source corpus.

The properties of future singularities are investigated in the universe dominated by dark energy including the phantom-type fluid. We classify the finite-time singularities into four classes and explicitly present the models which give rise to these singularities by assuming the form of the equation of state of dark energy. We show the existence of a stable fixed point with an equation of state w<-1 and numerically confirm that this is actually a late-time attractor in the phantom-dominated universe. We also construct a phantom dark energy scenario coupled to dark matter that reproduces singular behaviors of the Big Rip type for the energy density and the curvature of the universe. The effect of quantum corrections coming from conformal anomaly can be important when the curvature grows large, which typically moderates the finite-time singularities.

Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/4cc49539ce004f12a5eb21edcbfd7cbb0c6c1cc3

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Citations in the corpus

Viscous Cosmology for Early- and Late-Time Universe (2017, background): “linear equations of state one can see that other kind of singularities such as Sudden singularity [95–97] or Big Freeze [51, 98–100] appear. In fact, the future singularities are classiﬁed as follows [51] (see also [101] for a more detailed classiﬁcation): – 34 – • Type I (Big Rip): t → ts, a → ∞, ρ”
Dynamical systems applied to cosmology: Dark energy and modified gravity (2017, background): “Nojiri et al. (2005) instead classified the possible singularities appearing in general phantom dark energy models (including interactions with the matter fluid) and studied them with dynamical systems methods.”