Speaker
Description
We present an analysis that investigates the $H_0$ and $S_8$ tensions by considering a phantom dark energy model. The latter is a late-time model characterized by a future abrupt event known as the Little Rip (LR) model and characterised by one extra parameter, $\Omega_{\text{lr}}$, compared to the standard model, $\Lambda$CDM. To test this approach, we perform a statistical analysis by the MCMC method using the most recent observational data. We obtain a positive correlation in ($H_0$, $\Omega_{\text{lr}}$) and ($S_8$, $\Omega_{\text{lr}}$) planes, we notice that the Hubble and $S_8$ tensions are resolved only when we consider the observational data of the early Universe, but it is no longer so when we combine early and late measurements. For a complete statistical analysis we used the Akaike Information Criteria and Bayesian analysis of the evidence, we find that the LR model provides an improved fit to the CMB data.
| Abstract Category | Astrophysics & Cosmology |
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