Scalar perturbations in cosmological models with dark energy - dark matter interaction

Abstract

Scalar cosmological perturbations are investigated in the framework of a model with interacting dark energy and dark matter. In addition to these constituents, the inhomogeneous Universe is supposed to be filled with the standard noninteracting constituents corresponding to the conventional $\Lambda$CDM model. The interaction term is chosen in the form of a linear combination of dark sector energy densities with evolving coefficients. The methods of discrete cosmology are applied, and strong theoretical constraints on the parameters of the model are derived. A brief comparison with observational data is performed.

10 pages, no figures

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• Finite-time Cosmological Singularities and the Possible Fate of the Universe
• On structure formation from a small-scales-interacting dark sector
• Cosmological implications of an interacting model of dark matter \& dark energy
• Scalar and vector perturbations in a universe with discrete and continuous matter sources
• The late Universe with non-linear interaction in the dark sector: the coincidence problem
• Observational constraints on the interacting dark energy - dark matter (IDM) cosmological models
• III. Interacting Dark Energy: Summary of Models, Pathologies, and Constraints
• Are dark energy models with variable EoS parameter $w$ compatible with the late inhomogeneous Universe?
• Perfect fluids coupled to inhomogeneities in the late Universe
• I. Linear Interacting Dark Energy: Analytical Solutions and Theoretical Pathologies
• Cosmological Model with Cosmic transit behaviour in Brans-Dicke Theory
• One-loop power spectrum corrections in interacting dark energy cosmologies