Density perturbations in decaying holographic dark energy models

Details Density perturbations in decaying holographic dark energy models Density perturbations in decaying holographic dark energy models

2008-05-26

arxiv.org/abs/0805.3941v2

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

11pages, 5 figures

Scientific paper

We study cosmological perturbations in the context of an interacting dark energy model, where the holographic dark energy with IR cutoff decays into the cold dark matter (CDM). For this purpose, we introduce three IR cutoffs of Hubble horizon, particle horizon, and future event horizon. Here we present small perturbations under the case that effective equation of state (EOS: $\omega^{\rm eff}$) for the holographic energy density is determined to be the same negative constant as that for the CDM. Such new matter productions tend to dilute the density perturbations of CDM (matter contrast). For a decelerating universe of $\omega^{\rm eff}>-1/3$, the matter contrast is growing as the universe evolves, while for an accelerating universe of $\omega^{\rm eff}<-1/3$, the matter contrast is decaying, irrespective of the choice of IR cutoff. This shows clearly that the acceleration suppresses the growing of the density perturbations at the early universe.

Affiliated with

Also associated with

No associations

Rating

Density perturbations in decaying holographic dark energy models does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Density perturbations in decaying holographic dark energy models, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Density perturbations in decaying holographic dark energy models will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-321349