Exploring the Dark Universe: constraints on dynamical Dark Energy models from CMB, BAO and growth rate measurements

Abstract

In order to explain the current acceleration of the Universe, the fine tuning problem of the cosmological constant $\Lambda$ and the cosmic coincidence problem, different alternative models have been proposed in the literature. We use the most recent observational data from CMB (Planck 2018 final data release) and LSS (SDSS, WiggleZ, VIPERS) to constrain dynamical dark energy (DE) models. The CMB shift parameter, which traditionally has been used to determine the main cosmological parameters of the standard model $\Lambda CDM$ is employed in addition to data from redshift-space distortions through the growth parameter $A(z)=f(z){\sigma }_8(z)$ to constrain the mass variance ${\sigma }_8$. BAO data is also used to study the history of the cosmological expansion and the main properties of DE. From the evolution of $q(z)$ we found a slowdown of acceleration behaviour at low redshifts, and by using the Akaike and Bayesian Information Criterion (AIC, BIC) we discriminate different models those that are better suited to the observational data, finding that the interactive dark energy (IDE) model is the most favoured by observational data, including information from SNIa and Hz. The analysis shows that the IDE model is followed closely by EDE and $\Lambda CDM$ models, which in some cases fit better the observational data with individual probes.

arXiv comment31 pages, 10 figures, 12 tables, Matches the version published in IJMPD. arXiv admin note: text overlap with arXiv:1711.09291 by other authors

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