Growth of matter perturbations in the extended viscous dark energy models
| Autor: | da Silva, W. J. C., Silva, R. |
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| Rok vydání: | 2020 |
| Předmět: | |
| Zdroj: | Eur.Phys.J.C 81 (2021) 5, 403 |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1140/epjc/s10052-021-09177-7 |
| Popis: | In this work, we study the extended viscous dark energy models in the context of matter perturbations. To do this, we assume an alternative interpretation of the flat Friedmann-Lema\^itre-Robertson-Walker Universe, through the nonadditive entropy and the viscous dark energy. We implement the relativistic equations to obtain the growth of matter fluctuations for a smooth version of dark energy. As result, we show that the matter density contrast evolves similarly to the $\Lambda$CDM model in high redshift; in late time, it is slightly different from the standard model. Using the latest geometrical and growth rate observational data, we carry out a Bayesian analysis to constrain parameters and compare models. We see that our viscous models are compatible with cosmological probes, and the $\Lambda$CDM recovered with a $1\sigma$ confidence level. The viscous dark energy models relieve the tension of $H_0$ in $2 \sim 3 \sigma$. Yet, by involving the $\sigma_8$ tension, some models can alleviate it. In the model selection framework, the data discards the extended viscous dark energy models. Comment: 19 pages, 8 figures, 8 tables. Updated to match the published version |
| Databáze: | arXiv |
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