Density perturbations in decaying holographic dark energy models

Abstract

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: ${\omega }^{\mathrm{eff}}$) 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 ${\omega }^{\mathrm{eff}}>-1/3$, the matter contrast is growing as the universe evolves, while for an accelerating universe of ${\omega }^{\mathrm{eff}}<-1/3$, 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.

11pages, 5 figures

References in corpus (11)

• Holographic dark energy and cosmic coincidence
• Transition of the dark energy equation of state in an interacting holographic dark energy model
• Cosmologies with Energy Exchange
• Can vacuum decay in our Universe?
• Equation of state for an interacting holographic dark energy model
• Interpreting Cosmological Vacuum Decay
• Interacting Dark Energy and Cosmological Equations of State
• Holographic principle and dark energy
• Evolution of density perturbations in decaying vacuum cosmology
• Sourced Friedmann equations with holographic energy density
• Holographic interacting dark energy in the braneworld cosmology

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• Generalized Holographic Dark Energy and its Observational Constraints
• Cosmological constraints on the new holographic dark energy model with action principle
• Density perturbation in an interacting holographic dark energy model
• Cosmological Perturbations and the Running Cosmological Constant Model