Abstract
The dark energy model with barotropic equation of state, which interacts with dark matter by gravitation and by other force, which causes the energy-momentum exchange between them, is considered. Both components are described in approximation of ideal fluid, which are parameterized by density, equation of state and effective sound speed parameters. The three types of interactions between dark components are considered: interaction independent from their densities, interaction proportional to energy density of dark energy, and interaction proportional to energy density of dark matter. The equations that describe the expansion dynamics of homogeneous and isotropic Universe and evolution of densities of both components for different values of interaction parameter are obtained on the bases of the general covariant conservation equations and Einstein’s ones. For three kinds of interactions, the existing of the range of values of parameters of dark energy for which the densities of dark components are negative was shown. The conditions of positivity of energy density of dark energy and dark matter were written for which the constraints on the value of parameter of interaction were derived. The dynamics of expansion of the Universe with these interactions of dark energy and dark matter is analyzed.
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Published in Ukrainian in Kinematika i Fizika Nebesnykh Tel, 2016, Vol. 32, No. 4, pp. 3–22.
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Neomenko, R., Novosyadlyj, B. Dynamics of expansion of the Universe in the models with nonminimally coupled dark energy. Kinemat. Phys. Celest. Bodies 32, 157–171 (2016). https://doi.org/10.3103/S088459131604005X
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DOI: https://doi.org/10.3103/S088459131604005X