Stable Large-Scale Perturbations in Interacting Dark-Energy Model

Abstract

It is found that the evolutions of density perturbations on the super-Hubble scales are unstable in the model with dark-sector interaction $Q$ proportional to the energy density of cold dark matter (CDM) ${\rho }_m$ and constant equation of state parameter of dark energy $w_d$. In this paper, to avoid the instabilities, we suggest a new covariant model for the energy-momentum transfer between DE and CDM. Then we show that the the large-scale instabilities of curvature perturbations can be avoided in our model in the universe filled only by DE and CDM. Furthermore, by including the additional components of radiation and baryons, we calculate the dominant non-adiabatic modes in the radiation era and find that the modes grow in the power law with exponent at the order of unit.

14 pages, 2 figures. arXiv admin note: substantial text overlap with arXiv:1110.1807

References in corpus (30)

• Wilkinson Microwave Anisotropy Probe (WMAP) Three Year Results: Implications for Cosmology
• Dynamics of dark energy
• Large-scale instability in interacting dark energy and dark matter fluids
• Cosmologies with Energy Exchange
• Effects of the interaction between dark energy and dark matter on cosmological parameters
• Linear and nonlinear interactions in the dark sector
• TASI Lectures on the Cosmological Constant
• Testing the viability of the interacting holographic dark energy model by using combined observational constraints
• Stability of the curvature perturbation in dark sectors' mutual interacting models
• Dark Interactions and Cosmological Fine-Tuning
• Constraining Interactions in Cosmology's Dark Sector
• Interacting Agegraphic Dark Energy
• Statefinder Diagnostic and w-w' Analysis for the Agegraphic Dark Energy Models without and with Interaction
• Matter density perturbations in interacting quintessence models
• Adiabatic instability in coupled dark energy-dark matter models
• Gauge-invariant analysis of perturbations in Chaplygin gas unified models of dark matter and dark energy
• On the large-scale instability in interacting dark energy and dark matter fluids
• A Field Theory Model for Dark Matter and Dark Energy in Interaction
• Dynamics of interacting dark energy model in Einstein and Loop Quantum Cosmology
• Neutrino Dark Energy -- Revisiting the Stability Issue
• Interacting model of new agegraphic dark energy: Cosmological evolution and statefinder diagnostic
• Cosmological model with interactions in the dark sector
• The Adiabatic Instability on Cosmology's Dark Side
• Slow-Roll Suppression of Adiabatic Instabilities in Coupled Scalar Field-Dark Matter Models
• Linear and non-Linear Instabilities in Unified Dark Energy Models
• Non-parametric Dark Energy Degeneracies
• Neutrino Dark Energy
• Cosmological Signatures of the Interaction between Dark-Energy and Massive Neutrinos
• Stability of curvature perturbation with new covariant form for energy-momentum transfer in dark sector
• Interactions and Instabilities in Cosmology's Dark Sector

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• Cosmological constraints on interacting dark energy with redshift-space distortion after Planck data
• Nonlinear interacting cosmological models after Planck 2018 legacy release and the $H_0$ tension
• Testing coupled dark energy with large scale structure observation
• Coupled dark energy with perturbed Hubble expansion rate
• Cosmological constraints on coupled dark energy
• Probing the imprint of interacting dark energy on very large scales
• Scalar perturbations in cosmological models with dark energy - dark matter interaction
• Interacting phantom dark energy: new accelerating scaling attractors
• Stability analysis of an interacting holographic dark energy model
• Interacting parametrized post-Friedmann method
• One-loop power spectrum corrections in interacting dark energy cosmologies