Journal of Physical Studies 28(1), Article 1903 [6 pages] (2024) DOI: https://doi.org/10.30970/jps.28.1903 CONSTRAINTS ON THE INTERACTION OF QUINTESSENCE DARK ENERGY WITH DARK MATTER AND THE EVOLUTION OF ITS EQUATION OF STATE PARAMETER Roman Neomenko  Astronomical Observatory of Ivan Franko National University of Lviv, 8, Kyrylo & Mefodiy St., Lviv, UA–79005, Ukraine e-mail: roman.neomenko@lnu.edu.ua Received 05 December 2023; accepted 18 December 2023; published online 26 March 2024

The paper discusses the cosmological model with an interaction between dynamical quintessence dark energy and cold dark matter. Evolution of the dark energy equation of state parameter is defined by the dark energy adiabatic sound speed and the dark sector interaction parameter, which must be a more physically correct model then the one previously used, in which this evolution was determined by some fixed dependence on the scale factor. The constraints on the interaction parameter and other parameters of the model were obtained using the cosmic microwave background, baryon acoustic oscillations and the supernova SN Ia data.

Key words: interacting dark energy, dark matter, cosmological perturbations

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