Dark energy: Vacuum fluctuations, the effective phantom phase, and holography

By E. Elizalde, Shin'ichi Nojiri, Sergei D. Odintsov, Peng Wang. 2005

352 citations recorded by the source corpus.

We aim at the construction of dark energy models without exotic matter but with a phantomlike equation of state (an effective phantom phase). The first model we consider is decaying vacuum cosmology where the fluctuations of the vacuum are taken into account. In this case, the phantom cosmology (with an effective, observational $\ensuremath{\omega}$ being less than $\ensuremath{-}1$ ) emerges even for the case of a real dark energy with a physical equation of state parameter $\ensuremath{\omega}$ larger than $\ensuremath{-}1$. The second proposal is a generalized holographic model, which is produced by the presence of an infrared cutoff. It also leads to an effective phantom phase, which is not a transient one as in the first model. However, we show that quantum effects are able to prevent its evolution towards a big rip singularity.

Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/51caeb2b9098ffbbde51ac70a52b32983818229e

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Citations in the corpus

Phantom energy traversable wormholes (2005, background): “It was also shown that quantum corrections may prevent [25], or at least delay, the Big Rip by taking into account the back reaction of conformal quantum fields near the singularity [26, 27, 28], and the universe may end up in a deSitter phase before the scale factor blows up.”