Geodesic
Cosmological models with modified equations of state for dark energy
Vestnik Tverskogo gosudarstvennogo universiteta. Seriâ Prikladnaâ matematika, no. 3 (2023), pp. 19-40

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We consider cosmological scenarios which generalize the well-known $\Lambda$CDM and $w$CDM models and have the equations of state $p_x=w(a) \rho_x$ and $p_x=f(\rho_x)$ for dark energy. Here the factor $w(a)$ can depend on the scale factor $a$, $p_x$ and $\rho_x$ are dark energy pressure and density respectively. We analyze these models comparing their predictions with observational data for type Ia supernovae, the Hubble parameter $H(z)$ and baryon acoustic oscillations. From this point of view we obtain and investigate the most successful model $w(a)=w_0+w_1(1-a)^3$ among the considered scenarios.
Keywords: cosmological model, dark energy, equation of state, observational data. 
@article{VTPMK_2023_3_a1,
     author = {E. G. Vorontsova and G. S. Sharov},
     title = {Cosmological models with modified equations of state for dark energy},
     journal = {Vestnik Tverskogo gosudarstvennogo universiteta. Seri\^a Prikladna\^a matematika},
     pages = {19--40},
     publisher = {mathdoc},
     number = {3},
     year = {2023},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VTPMK_2023_3_a1/}
}
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E. G. Vorontsova; G. S. Sharov. Cosmological models with modified equations of state for dark energy. Vestnik Tverskogo gosudarstvennogo universiteta. Seriâ Prikladnaâ matematika, no. 3 (2023), pp. 19-40. http://geodesic.mathdoc.fr/item/VTPMK_2023_3_a1/