http://arxiv.org/abs/2202.01749
We study the consequences of an enlarged 4 parameter dynamical dark energy (4pDE) equation of state using the latest Planck, BAO, and Pantheon supernovae data. This parameterization of the dark energy equation of state incorporates a generic non-linear monotonic evolution of the dark energy equation of state, where the four parameters are the early and the present value of the equation of state, the transition scale factor, and the sharpness of the transition. In this study, we use SH0ES $M_B$ prior and the KIDS/Viking $S_8$ prior while keeping the neutrino mass $\Sigma m_\nu$ as a free parameter. We show that in this case, the dynamical dark energy 4pDE model can bring down the Hubble tension to $\sim 2.5 \sigma$ level and the $S_8$ tension to $\sim 1.5 \sigma$ level when tested against Planck, BAO, and Pantheon supernovae data together. We also compare our results with the well-explored CPL model. We find that the present data can not constrain all the four dark energy equations of state parameters ensuring the fact that the present observations do not demand a complex non-linear multi-parameter evolution of the time-dependent DE equation of state. We also report that with SH0ES $M_B$ and KIDS/Viking $S_8$ prior 4pDE and CPL model favours a non-zero value for the neutrino mass parameter at the most at $\sim 1 \sigma$ level ($\Sigma m_\nu \sim 0.2 \pm 0.1$ eV).
R. Sharma, K. Pandey and S. Das
Fri, 4 Feb 22
47/65
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