3 papers
astro-ph.CO2024
Analytical reconstruction of equivalent purely kinetic k-essence description for barotropic fluid models
Dalibor Perkovic, Hrvoje Stefancic
A novel approach to the class of cosmic barotropic fluids in which the speed of sound squared is defined as a function of the Equation of State parameter, so called mode…
gr-qc2020
Barotropic fluid compatible parametrizations of dark energy
Dalibor Perkovic, Hrvoje Stefancic
Parametrizations of Equation of state parameter as a function of the scale factor or redshift are frequently used in dark energy modeling. The question investigated in this paper i…
gr-qc2019
Dark sector unifications: dark matter-phantom energy, dark matter -- constant dark energy, dark matter-dark energy-dark matter
Dalibor Perkovic, Hrvoje Stefancic
The paper brings a novel approach to unification of dark matter and dark energy in terms of a cosmic fluid. A model is introduced in which the cosmic fluid speed of sound squared i…