Instability of agegraphic dark energy models

Abstract

We investigate the agegraphic dark energy models which were recently proposed to explain the dark energy-dominated universe. For this purpose, we calculate their equation of states and squared speeds of sound. We find that the squared speed for agegraphic dark energy is always negative. This means that the perfect fluid for agegraphic dark energy is classically unstable. Furthermore, it is shown that the new agegraphic dark energy model could describe the matter (radiation)-dominated universe in the far past only when the parameter $n$ is chosen to be $n>n_c$, where the critical values are determined to be $n_c=2.6878(2.5137752)$ numerically. It seems that the new agegraphic dark energy model is no better than the holographic dark energy model for the description of the dark energy-dominated universe, even though it resolves the causality problem.

15 pages 4 figures

References in corpus (39)

• Observational Evidence from Supernovae for an Accelerating Universe and a Cosmological Constant
• Measurements of Omega and Lambda from 42 High-Redshift Supernovae
• First Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Determination of Cosmological Parameters
• Wilkinson Microwave Anisotropy Probe (WMAP) Three Year Results: Implications for Cosmology
• Dynamics of dark energy
• The Cosmological Constant and Dark Energy
• First Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Preliminary Maps and Basic Results
• Type Ia Supernova Discoveries at z>1 From the Hubble Space Telescope: Evidence for Past Deceleration and Constraints on Dark Energy Evolution
• Cosmological parameters from SDSS and WMAP
• The Supernova Legacy Survey: Measurement of Omega_M, Omega_Lambda and w from the First Year Data Set
• A Model of Holographic Dark Energy
• Effective Field Theory, Black Holes, and the Cosmological Constant
• The Second Data Release of the Sloan Digital Sky Survey
• First Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Implications for Inflation
• Entropy Bounds and Dark Energy
• The Third Data Release of the Sloan Digital Sky Survey
• Holographic dark energy and cosmic coincidence
• Cosmological parameters from combining the Lyman-alpha forest with CMB, galaxy clustering and SN constraints
• Transition of the dark energy equation of state in an interacting holographic dark energy model
• A Dark Energy Model Characterized by the Age of the Universe
• A New Model of Agegraphic Dark Energy
• The end of unified dark matter?
• The Holographic Dark Energy in a Non-flat Universe
• Equation of state for an interacting holographic dark energy model
• Cosmological Constraints on New Agegraphic Dark Energy
• Dynamical dark energy: Current constraints and forecasts
• Bulk Viscous Cosmology
• Instability of holographic dark energy models
• Statefinder Diagnostic and w-w' Analysis for the Agegraphic Dark Energy Models without and with Interaction
• Cosmological implications of Karolyhazy uncertainty relation
• An Uncertainty Relation of Space-Time
• Stability properties of some perfect fluid cosmological models
• Holographic principle and dark energy
• Interacting Dark Energy and the Cosmic Coincidence Problem
• A Note on Agegraphic Dark Energy
• Brans-Dicke Theory as a Unified Model for Dark Matter - Dark Energy
• From spacetime foam to holographic foam cosmology
• Observational Constraints on Agegraphic Dark Energy
• Age constraints on the Agegraphic Dark Energy Model

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• Thermodynamical description of the interacting new agegraphic dark energy
• On An Interacting New Holographic Dark Energy Model: observational constraints
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• Interacting new agegraphic Phantom model of dark energy in non-flat universe
• A Dark Energy Model with Generalized Uncertainty Principle in the Emergent, Intermediate and Logamediate Scenarios of the Universe
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• Interacting Agegraphic Dark Energy Model in DGP Braneworld Cosmology: Dynamical System Approach
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• Power Law Entropy Corrected New-Agegraphic Dark Energy in Hořava-Lifshitz Cosmology
• Reconstructions of $f(\mathcal{P})$ and $f(\mathcal{Q})$ gravity models from $(m,n)$-type Barrow Holographic Dark Energy: Analysis and Observational Constraints
• On the stability of the dark energy based on generalized uncertainty principle
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• Reconstructions of Einstein-Aether Gravity from Barrow Agegraphic and New Barrow Agegraphic Dark Energy models: Examinations and Observational Limits
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• Study of Some Cosmological Parameters for Interacting New Holographic Dark Energy Model in f(T) Gravity
• f(R) in Holographic and Agegraphic Dark Energy Models and the Generalized Uncertainty Principle
• Interacting dark fluid in the universe bounded by event horizon : A non-equilibrium prescription
• Hairy black holes in dilatonic Einstein-Gauss-Bonnet theory
• Revisiting Agegraphic Dark Energy in Brans-Dicke Cosmology
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