4 papers
2-field model of dark energy with canonical and non-canonical kinetic terms
O. Sergijenko
We generalize quintom to include the tachyonic kinetic term along with the classical one. For such a model we obtain the expressions for energy density and pressure. For the spatia…
Constraints on the dark energy with barotropic equation of state: assessing the importance of different observations
O. Sergijenko
For dynamical dark energy with the barotropic equation of state we determine the mean values of parameters and their confidence ranges together with other cosmological parameters o…
Dipole of the luminosity distance as a test for dark energy models
O. Sergijenko
The dependence of Hubble parameter on redshift can be determined directly from the dipole of luminosity distance to Supernovae Ia. We investigate the possibility of using the data…
Observational constraints on tensor perturbations in cosmological models with dynamical dark energy
O. Sergijenko
We constrain the contribution of tensor-mode perturbations with free in the models with dynamical dark energy with the barotropic equation of state using Planck-2015 data on…