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

Understand

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.