Evolution of cosmological perturbations in the models with interacting dynamical dark energy

Abstract

Evolution of cosmological perturbations is considered in the model with dynamical dark energy which non-gravitationally interacts with dark matter. The dark energy equation of state parameter (EoS) is varying in time and is parameterized by its adiabatic sound speed. Such model of interacting dark energy has advantages over model with constant EoS, because it avoids non-adiabatic instabilities of dark energy at radiation dominated epoch for certain types of interaction in dark sector. The stability conditions for solutions of equations of dark energy perturbations were derived. The impact of strength of additional interaction between dark components on the evolution of density and velocity perturbations in them is analysed for quintessence and phantom types of dark energy.

arXiv comment11 pages, 3 figures

References in corpus (34)

• Observational Evidence from Supernovae for an Accelerating Universe and a Cosmological Constant
• Measurements of Omega and Lambda from 42 High-Redshift Supernovae
• Coupled Quintessence
• Interacting Quintessence
• Planck evidence for a closed Universe and a possible crisis for cosmology
• Can interacting dark energy solve the $H_0$ tension?
• Large-scale instability in interacting dark energy and dark matter fluids
• Dynamics of interacting dark energy
• Consequences of dark matter-dark energy interaction on cosmological parameters derived from SNIa data
• Cosmological Evolution With Interaction Between Dark Energy And Dark Matter
• Evidence for anisotropy of cosmic acceleration
• Linear and nonlinear interactions in the dark sector
• Interacting Dark Energy and Dark Matter: observational Constraints from Cosmological Parameters
• Interacting dark energy with time varying equation of state and the $H_0$ tension
• Interacting models may be key to solve the cosmic coincidence problem
• Adiabatic initial conditions for perturbations in interacting dark energy models
• Interacting models of soft coincidence
• A new interacting two fluid model and its consequences
• On the large-scale instability in interacting dark energy and dark matter fluids
• Early-type Host Galaxies of Type Ia Supernovae. II. Evidence for Luminosity Evolution in Supernova Cosmology
• Dark Coupling and Gauge Invariance
• Relieving the Tension between Weak Lensing and Cosmic Microwave Background with Interacting Dark Matter and Dark Energy Models
• Alleviation of Cosmic Age Problem In Interacting Dark Energy Model
• Do the cosmological observational data prefer phantom dark energy?
• Search for sterile neutrinos in a universe of vacuum energy interacting with cold dark matter
• Exploring neutrino mass and mass hierarchy in interacting dark energy models
• A preliminary analysis of the energy transfer between the dark sectors of the Universe
• Reconstruction of interacting dark energy models from parameterizations
• Sound speed of scalar field dark energy: weak effects and large uncertainties
• Properties and uncertainties of scalar field models of dark energy with barotropic equation of state
• FLRW accelerating universe with interactive dark energy
• Dynamics of minimally coupled dark energy in spherical halos of dark matter
• Constraints on interacting dynamical dark energy and a new test for $\Lambda$CDM
• Dynamics of expansion of the Universe in the models with non-minimally coupled dark energy

Cited by in corpus (2)

• Cosmological implications of an interacting model of dark matter \& dark energy
• Some Classes of Interacting Two-Fluid Model of the Expanding Universe